Modular Construction of Protected 1,2/1,3-Diols, -Amino Alcohols, and -Diamines via Catalytic Asymmetric Dehydrative Allylation: An Application to Synthesis of Sphingosine
A new enantioselective catalysis has been developed for the one-step construction of methylene-bridged chiral modules of 1,2- and 1,3-OH and/or NH function(s) from δ- or λ-OH/NHBoc-substituted allylicalcohols and “H2C═O”/“H2C═NBoc”. A protonic nucleophile, either in situ-generated CH2OH or CH2NHBoc, is intramolecularly allylated to furnish eight possible 1,2- or 1,3-O,O, -O,N, -N,O, and -N,N chiral
Vinyl derivatives of heterocyclic systems and their polymers: 3-vinyl-1,2,5-thiadiazole
作者:V. Bertini、F. Lucchesini、A. De Munno
DOI:10.1016/0040-4020(80)87026-8
日期:1980.1
3-Vinyl-1,2,5-thiadiazole is prepared by different methods: by one-pot reaction from 1,2,5-thiadiazole, by cyclization of 3,4-diamino-1-butene, and by the Wittig procedure either from 1,2,5-thiadiazolylimethylenetriphenyl-phosphorane or from 3-formyl-1,2,5-thiadiazole. Some physical and chemical properties are described.