3790
COMMUNICATIONS TO THE EDITOR
and the change in absorbancy a t 245 m p 5 are independent of temperature between 10' and 25'. These data indicate t h a t the reported4 spectral peak and the absorbancy changes at 245 mp are independent phenomena. The former is a component of the pH difference spectrum of chymotrypsin. The latter is due to light scattering caused by changes in molecular aggregation of the acetyl enzyme. This implies that the monoacetyl-enzyme (AC-A) and chymotrypsin are in a different state of aggregation a t p H 5.5 to 9.0, and t h a t the deacylation and deaggregation of hCrl. are intimately related events.
Trol. 82
Upon hydrolysis, however, it gave a compound (V) with physical properties indistinguishable from deoxyajmalol-B.6 Since the absolute stereochemistry of this compound is knownj5 the stereoformula (I) for sarpagine is established with the exception of configuration of the ethylidene group. ( 5 ) 31. I;. Bartlett, E. Schlittler. R. Sklar, W. I . Taylor, R. I,. S. d m a i and E. TVenkert, THISJOKRSAL, 84, 3792 ( 1 B B O ) . RESEARCH DEPARTMEST CIBA PHARMACEUTICAL PRODUCTS,
ISC.
SU?*IMIT, S.J .
h l . F. RARTLETT I. ( 4 j Baltimore Biological Laboratory.
cjn a rutary
July 20, 1960
COMMUNICATIONS TO THE EDITOR
thiazolidineacetic acid, formed by quantitative paper chromatography using ninhydrin as the color reagent. From a suitable batch of reaction mixture 6-aminopenicillanic acid (11) has been isolated by absorption on IR-120 (H+), elution with "4OH a t pH 7.0, concentration in uacuo, and adjusting the fiH to -1.4. The recrystallized product had m.p. 207-208' (dec.) and [ c r ] 4-277 ~ ~ ~ (c 1.0 in 0.1 N hydrochloric acid).5 I t assayed approximately 2730 u.,/mg. based on sodium benzylpenicillin by the hydroxylamine colorimetric procedure6 and by microbiological determination after phenylacetylation' (theor., 2732 u./mg.). Acylation of (11) with the appropriate acid chlorides in aqueous acetone buffered a t pH '7.0 to 7.3 has given good yields of crystalline potassium salts of benzylpenicillin and phenoxymethylpenicillin, which are identical in all respects to the product prepared by fermentation. Both phenoxymethylpenicillin (V) and allylmercaptomethylpenicillin (0) are hydrolyzed by this microbial acylase system. Details on the distribution of this acylase in microorganisms, and its activity on a series of penicillins, including a large number of new semi-synthetic penicillins will be reported elsewhere.
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TABLE I ALKALOID RETENTIOSTIMES Time, Compound min.Q>t 1. Lupin alkaloids Cytisine hlethylcytisine Methylcytisine Soxide Lupanine 13-Hydroxylupanine Slatrine Lupinine Sparteine a-Isosparteine 13-Hydroxysparteine
Compound Pieopine Papaverine Thebaine
5.1 4.3
4.
5.8 5.5 11 .6 8.5
5.20' 1 4 ,3d
5.
2.
Amaryllidaceae
Galanthine Acetylcaranine Lycorenine Galanthamine Crinine Powelline Tazettine Belladine
3.
80.0''
8.P 15 4 35.1 16.8' 25,!Y 40.3
steroidal alkaloids 40 6'~' 74 3r.c 77 .3C'e
Solanidine Solasodine Tomatidine
19.0
10.5 10.6
6.
7.8
L*liscellaneous 3 .0 1.6 0 7' 4.8' 1 6 .2' 50 8 12.7' 33 0 44.7 11.F
Atopine Caffeine Cinchonine Cocaine Corydaline Cryptopine Himbacine Piperine Protopine Quinine
9.5 15.8 15.2 8.7
Pa$avei.aceac
Codeine Gnoscopine Laudanosine LlorDhine
Indole Alkaloids
Brucine Coronaridine Ibogamine Ibogaine Serpentine Strychnine Voacangine
1,:d 5.Qd
Time, min.a,b 9.1 3.5.3 13.2
8.2 90.6 21.0
11.0
Argon ionization detector, 6 ft X 4 nim i d columns b Pressure 15 psi , 2-3/100 SE-30 on Chromosorb tV, 80100 mesh, temperature 204' unless otherwise noted TemTemperature 160". e Pressure 10 psi H. T. HUANG perature 222' A. R. ENGLISH T. A. SETO product was identified as unchanged starting G. M. SHULL material by standard methods. The power of this B. A. SOBIX analytical tool is illustrated in a separation of
( 5 ) j . C . Sheehan a n d K. R . Henery-Logan, THISJ O U R N A L , 81, 5833 (19591, report [ a ] l l 4-273 ~ ( C 1.2 in 0.1 N hydrochloric acid). (6) G. Boxer and P. hI. E v e r e t t , A d . Chem., 21, 670 (1949).
RESEARCH LABORATORIES CHAS.PFIZER& Co., I s c . GROTON, COSSECTICUT, ASD -MAYWOOD, NEW JERSEY RECEIVED MAY28, 1960
Papaaeraceae alkaloids (Fig. 1).
SEPARATION OF ALKALOIDS BY GAS CHROMATOGRAPHY
Sir: I n the past, the separation of alkaloids from crude alkaloid mixtures has depended upon fractional crystallization, precipitation, countercurrent extraction and either adsorption or liquid phase partition chromatography. Several recent communications have reported the use of gas phase chromatographic techniques for the separation and identification of steroidsizz and high molecular weight fatty primary amines3 This communication demonstrates the feasibility of this method for the isolation, separation and identification of alkaloids. Our attention has been focused on alkaloids with molecular weights above 250, since suitable modifications of the conditions should permit separations of lower molecular weight substances without d i f f i ~ u l t y . ~ Alkaloids listed in the table gave single component sharp peaks, consistent with the absence of decomposition. A typical sample was 1-3 pl. of a 0.a-l.070 solution of the alkaloid in methanol, acetone or chloroform. In several cases (Nmethylcytisine, crinine, ibogaine and solanidine) macro samples were chromatographed and the (1) W. J. A. VandenHeuvel, C . C. Sweeley a n d E. C. Horning, THIS 82, 3481 (1960). (2) R. K Beerthuis and J. H . Recourt, A-aluue, 186, 372 (1960). (3) J. h'elson and A. hfilun, Chemistvy &I~ndusiuy, 663 (1960). ( 4 ) Cf. L. D. Quin, J. Oug. Chem., 24, 911 (1959).
JOURNAL,
I -_
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___ V Y
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i
n g 1
H A LLO~D o r CI~EMISTRY OF H hI FALES LABORATORY XATURAL PRODUCTS P F HIGHET XATIOLAL HEARTISSTITUTE \I' J A t AYDE\HEUVEL BETHESDA 14, MARYLAYD IV C I ~ I L D M A N RECEIVEDJUNE 16, 1960 T H E ENTROPY OF ACTIVATION OF ADDITION O F METHYL RADICALS TO UNSATURATED COMPOUNDS POSSESSING T H E SAME REACTION CENTER'
Sir: Addition of methyl radicals to ethylene,' pro. pylene,3 isobuterie,2 ~ t y r e n e , ~ a-methylstyrene, butadiene4 and isoprene4 was studied in this (1) This work was supported b y a g r a n t from t h e h-ational Science Foundation ( 2 ) R. P . Buckley and 31.Szwarc, PYOC. R o y . Soc., A240,396 (1957). (3) F. Leavitt, M. Levy a n d SI.Szwarc, THIS J O U R N A L , 77, 5493 (1955). (4) A. Rajbenbach and 11. Szwarc, P i n c . Roy. SOL., A251, 1ZG6 (1959).
