作者:Paul J. Kropp、Norbert J. Pienta、Joy A. Sawyer、Richard P. Polniaszek
DOI:10.1016/s0040-4020(01)92370-1
日期:——
The previously observed cyclopropaoation of alkenes by irradiation of diiodomethane (I) in their presence has been studied in more detail and found to be a synthetically useful procedure which is significantly less subject to steric effects than the traditional Simmons-Smith method. The results from photocyclopropanation of a variety of alkenes are summarized in Tables 1 and 3–4. In a number of cases
Copper-Catalyzed Enantioselective Synthesis of <i>trans</i>-1-Alkyl-2-substituted Cyclopropanes via Tandem Conjugate Addition−Intramolecular Enolate Trapping
作者:Tim den Hartog、Alena Rudolph、Beatriz Maciá、Adriaan J. Minnaard、Ben L. Feringa
DOI:10.1021/ja105704m
日期:2010.10.20
Cu-TolBINAP-catalyzed conjugate addition of Grignard reagents to 4-chloro-alpha,beta-unsaturated esters, thioesters, and ketones leads to 4-chloro-3-alkyl-substituted thioesters and ketones in up to 84% yield and up to 96% ee upon protonation of the corresponding enolates at low temperature. Tandem conjugate addition-enolate trapping, however, yields trans-1-alkyl-2-substituted cyclopropanes in up to 92% yield and up to 98% ee. The versatility of this reaction is illustrated by the formation of key intermediates for the formal syntheses of cascarillic acid and grenadamide.
KROPP, P. J.;PIENTA, N. J.;SAWYER, J. A.;POLNIASZEK, R. P., TETRAHEDRON, 1981, 37, N 19, 3229-3236
作者:KROPP, P. J.、PIENTA, N. J.、SAWYER, J. A.、POLNIASZEK, R. P.
DOI:——
日期:——
TANK-BINDING KINASE INHIBITOR COMPOUNDS
申请人:Gilead Sciences Drive
公开号:US20170174713A1
公开(公告)日:2017-06-22
Compounds having the following formula (I) and methods of their use and preparation are disclosed: