Diastereoselective titanium-mediated construction of cis-2,3-ring annelated 1-(2′-chloroethyl)cyclopropanols
作者:Frédéric Lecornué、Jean Ollivier
DOI:10.1039/b211642a
日期:——
Titanium(IV)-mediated cyclopropanation induced by reaction of cycloalkylmagnesium bromides 1a-e in the presence of titanium tetraisopropoxide with ethyl beta-chloropropionate 2 yielded cis-fused 1-(2'-chloroethyl)cyclopropanols 3b-e with diastereoselectivity highly depending on the ring size. Unexpected rearrangementproducts 5d,e were isolated in some cases.