Intermolecular C–H functionalization versus cyclopropanation of electron rich 1,1-disubstituted and trisubstituted alkenes
作者:Dominic L. Ventura、Zhanjie Li、Michael G. Coleman、Huw M.L. Davies
DOI:10.1016/j.tet.2008.11.059
日期:2009.4
Rhodium(II)-catalyzed reactions of aryldiazoacetates with electron rich 1,1-disubstituted and trisubstituted alkenes were systematically studied. The regio-, diastereo- and enantioselectivity of the chemistry was profoundly influenced by the nature of the substrates and the catalyst. Conditions were developed for either selective cyclopropanation or C–Hinsertion. Both reactions can be achieved with
Preparation of New Chiral Building Blocks by a Mukaiyama–Michael Reaction of 2-(Phenylsulfonyl)cyclopent-2-en-1-one
作者:Masahisa Nakada、Ryoji Sugiyama
DOI:10.1055/a-2030-7082
日期:——
proceeds in 77% yield with a dr of 22:1 is also described. Because both enantiomers of the ligand for this Mukaiyama–Michael reaction are available, a method for the synthesis of all four stereoisomers of the product as useful chiralbuildingblocks has been established.