(+)-syn-Benzotriborneol: the first functionalised enantiopure C3-symmetric benzocyclotrimer
作者:Fabrizio Fabris、Luca Bellotto、Ottorino De Lucchi
DOI:10.1016/s0040-4039(02)02789-2
日期:2003.2
Copper(I) thiophencarboxylate readily and effectively cyclotrimerises protected 5-bromo-6-trimethylstannylborn-5-en-2-ols, leading to oxygen-functionalised benzocyclotrimers. The remarkably high syn to anti ratio is driven by relative displacement of the halide and metal on the alkene moiety and depends on the steric hindrance of the protecting group of the hydroxy function. The less hindered methyl