Triply convergent, stereospecific alkene formation via Peterson olefination
摘要:
alpha-Iodo silanes 8 were prepared from alpha-hydroxy silanes and after halogen/metal exchange and treatment with copper(I) bromide-dimethyl sulfide were coupled with acid chlorides to yield alpha-silyl ketones 2. Cram controlled addition with a variety of nucleophiles followed by treatment with acid or base led to either the (E)- or (Z)-alkene in good overall yields from the iodide (47-67%) and with excellent stereoselectivities ( > 95/ < 5 for disubstituted cases and 67/33 to 95/5 for trisubstituted). The procedure was used iteratively in the total synthesis of 4(E),8(Z)-tetradecadien-1-yl acetate (15) in > 95/ < 5 isomeric purity.
DOI:
10.1021/jo00002a028
作为产物:
描述:
(Z)-1-trimethylsilyldec-4-en-1-ol 以96%的产率得到
参考文献:
名称:
BARRETT, ANTHONY G. M.;FLYGARE, JOHN A., J. ORG. CHEM., 56,(1991) N, C. 638-642