Abstract:
OPTICALLY ACTIVE B-HALOGENOALKYL ISOCYANATES ARE OBTAINED BY RE-ARRANGEMENT OF N-HALOGENOAZETIDINONES-(2) EFFECTED BY RADICAL-FORMING CATALYSTS IN THE PRESENCE OF UNSATURATED COMPOUNDS AS CO-CTALYSTS. DUE TO THEIR GROUPS OF DIFFERENT DEGREES OF REACTIVITY THE PRODUCTS ARE USEFUL INTERMEDIATES FOR THE SYNTHESIS OF HETEROCYCLIC COMPOUNDS. THEY ARE, FURTHERMORE, USEFUL FOR SPLITTING RACEMIC MIXTURES.
Abstract:
N-halogeno-alkyl- Beta -lactams are rearranged into Beta halogeno-alkyl-isocyanates by contacting them with unsaturated organic compounds, optionally under irradiation. The products are highly reactive and useful for the synthesis of heterocyclic compounds.
Abstract:
1. A PROCESS FOR THE PREPARATION OF A B-HALOALKYLISOCYANATE OF THE FORMULA X-C(-R3)(-R4)-C(-R1)(-R2)-N=C=O WHEREIN X IS CHLORINE OR BROMINE AND R1,R3 AND R4, TAKEN ALONE, ARE HYDROGEN, ALKYL OF 1 TO 13 CARBONA TOMS, ALKENYL OF 2 TO 13 CARBON ATOMS, CHLOROALKYL OF 1 TO 13 CARBON ATOMS, BROMOALKYL OF 1 TO 13 CARBON ATOMS, CYCLOALKYL OF 5 TO 6 CARBON ATOMS, OR PHENYL, AND WHEREIN R1, T2, R3 AND R4, TAKEN PAIRWISE ARE ALKYLENE OR ALKENYLENE OF 2 TO 6 CARBON ATOMS OR PART OF A BICYCLIC OR TRICYCLIC CARBOXYLIC SATURATED OR MONO-SATURATED RING SYSTEM OF UP TO 13 CARBON ATOMS, WHICH PROCESS COMPRISES CONTACTING, AT A TEMPERATURE OF ABOUT-30*C. TO ABOUT +250* C., A LACTAM OF THE FORMULA X-N
Abstract:
What is disclosed are 4-amino-2-ureido (or -thioureido)-pyrimidine-5-carboxylic acid anilides of the formula further defined in the specification, and physiologically acceptable acid addition salts thereof, methods for treating adiposity and disturbances of the lipometabolism with these compounds or salts, and pharmaceutical compositions containing these compounds or salts and useful for inducing anorexia or affecting the lipometabolism.