Synthesis of key intermediates for a concise and convergent approach to the marine natural product eleutherobin
摘要:
Synthesis of 1,6-syn-5,6-anti-2-methyl-5-isopropyl-bicyclo[4.3.0]non-2-en-8-one in three steps from (rac)-phellandrene; and 1,6-syn-1-methyl-6-methoxy-3-aza-9-oxabicyclo[4.2.1]non-7-en-4-one in five steps from 2-methoxy-5-methylfuran and tetrabromoacetone, provided these key intermediates for the construction of the skeleton of eleutherobin. (C) 1999 Elsevier Science Ltd. All rights reserved.
Synthesis of (1R,5R,6R)-2-(6-hydroxymethyl-5-isopropyl-2-methylcyclohex-2-enyl)-N- methoxy-N-methylacetamide 8 from R-(-)-phellandrene in six steps, and (3aR*,4S*,6R*,6aS*)- (6-hydroxymethyl-4-methoxy-2,2,6-trimethyltetrahydrofuro[3,4-d][1,3]dioxol- 4-yl)acetic acid methyl ester 17 from tetrabromoacetone and 2-methoxy-5-methylfuran in six steps, provided two key fragments which have been combined to