2,4-Dinitrobenzenesulfonamides: A simple and practical method for the preparation of a variety of secondary amines and diamines
作者:Tohru Fukuyama、Mui Cheung、Chung-Kuang Jow、Yuko Hidai、Toshiyuki Kan
DOI:10.1016/s0040-4039(97)01334-8
日期:1997.8
amines and 2,4-dinitrobenzenesulfonyl chloride, can be alkylated by the Mitsunobu reaction or by the conventional methods to give N,N-disubstituted sulfonamides in excellent yields. Since 2,4-dinitrobenzenesulfonamides can be removed without deprotecting 2-nitrobenzenesulfonamides, a widevariety of diamines could be prepared by the combined use of these protecting/activating groups.
recognition of the substrate structure by catalyst 3 enabled substrate-selective silylation of long-chain primaryalcohols. Silylation of A proceeded 11 times faster than that of B by recognition of a one-carbon difference between primaryalcohols A and B. Preferential silylation of A took place over that of C by a factor of 21 owing to discrimination of the remotefunctionality at C(5) from the reacting