A More Comprehensive and Highly Practical Solution to Enantioselective Aldehyde Crotylation
摘要:
The enantioselective crotylation of aldehydes with 1,2-diaminochlorocrotylsilane reagents is effectively catalyzed by Sc(OTf)(3). The one significant limitation on the utility of these reagents - substrate scope - has thus been addressed. The net result is the most comprehensive and highly practical method for enantioselective aldehyde crotylation yet advanced.
A Highly Stereoselective, Efficient, and Scalable Synthesis of the C(1)–C(9) Fragment of the Epothilones
作者:Corinne N. Foley、James L. Leighton
DOI:10.1021/acs.orglett.5b03034
日期:2015.12.4
second-generation synthesis of the C(1)–C(9) fragment of the epothilones is reported. The key tandem intramolecular silylformylation/crotylsilylation/“aprotic” Tamao oxidation sequence has been redeveloped as a stepwise intermolecular variant, allowing excellent levels of diastereoselectivity in the crotylation step and proceeds in 50% overall yield on gram scale. An improved synthesis of the homopropargyl
COMPOSITIONS AND METHODS FOR STEREOSELECTIVE ALDEHYDE ALLYLATION AND CROTYLATION
申请人:KIM Hyunwoo
公开号:US20120190875A1
公开(公告)日:2012-07-26
Compositions and methods for practical, stereoselective allylation and crotylation for aldehyde substrates are described. The compositions and methods comprise reagents for allylation and/or crotylation and acids. In some embodiments, the reagents and acids are pre-mixed.
A More Comprehensive and Highly Practical Solution to Enantioselective Aldehyde Crotylation
作者:Hyunwoo Kim、Stephen Ho、James L. Leighton
DOI:10.1021/ja200712f
日期:2011.5.4
The enantioselective crotylation of aldehydes with 1,2-diaminochlorocrotylsilane reagents is effectively catalyzed by Sc(OTf)(3). The one significant limitation on the utility of these reagents - substrate scope - has thus been addressed. The net result is the most comprehensive and highly practical method for enantioselective aldehyde crotylation yet advanced.
Tandem Silylformylation−Crotylsilylation/Tamao Oxidation of Internal Alkynes: A Remarkable Example of Generating Complexity from Simplicity
作者:Jared T. Spletstoser、Michael J. Zacuto、James L. Leighton
DOI:10.1021/ol802489w
日期:2008.12.18
The rhodium-catalyzed tandem silylformylation-crotylsilylation reaction has been extended to include internal alkynes. Tamao oxidation of the initial product leads to the production of a substituted enol, which undergoes highly diastereoselective tautomerization. The resulting one-pot procedure fashions three new stereocenters, a ketone, and a terminal alkene from a butenyl group, a propynyl group
铑催化的串联甲硅烷基甲酰化-巴豆基甲硅烷基化反应已扩展到包括内部炔烃。初始产物的 Tamao 氧化导致取代的烯醇的产生,该烯醇经历高度非对映选择性互变异构化。由此产生的一锅法由丁烯基、丙炔基、甲硅烷基氢化物、H2O2 和 CO 形成三个新的立体中心、一个酮和一个末端烯烃。