Concerning the diastereofacial selectivity of aldol reactions of chiral methyl ketone enolates: Evidence for remote chelation in the bafilomycin aldol reaction
作者:William R. Roush、Thomas D. Bannister、Michael D. Wendt
DOI:10.1016/s0040-4039(00)61340-0
日期:1993.1
Evidence is presented that the aldol reactions of the lithium enolates of 4 and 7 proceed preferentially by way of chelated transition structure 19.
证据表明,4和7的烯醇锂的醛醇缩合反应优先通过螯合的过渡结构19进行。
Stereoselective synthesis of the C(13)–C(25) segment of bafilomycin A1
作者:William R. Roush、Thomas D. Bannister
DOI:10.1016/s0040-4039(00)92509-7
日期:1992.6
The aldol reaction of 2 and the lithium enolate of 3 provides the bafilomycin C(13)-C(25) fragment 1 with 8 : 1 stereoselectivity.
Studies on the Synthesis of Bafilomycin A<sub>1</sub>: Stereochemical Aspects of the Fragment Assembly Aldol Reaction for Construction of the C(13)−C(25) Segment
作者:William R. Roush、Thomas D. Bannister、Michael D. Wendt、Jill A. Jablonowski、Karl A. Scheidt
DOI:10.1021/jo016413f
日期:2002.6.1
lithium enolate aldolreaction. In contrast, the aldolreaction of 6a and the chlorotitanium enolates of 7a,c were much less sensitive to the nature of the C(15)-hydroxyl protectinggroup. Studies of the reactions of chiral aldehydes with Takai's (gamma-methoxyallyl)chromium reagent 40 are also described. The stereoselectivity of these reactions is also highly dependent on the protectinggroups and stereochemistry
An NMR Method for Assigning Relative Stereochemistry to β-Hydroxy Ketones Deriving from Aldol Reactions of Methyl Ketones
作者:William R. Roush、Thomas D. Bannister、Michael D. Wendt、Michael S. VanNieuwenhze、Darin J. Gustin、Garrett J. Dilley、Gregory C. Lane、Karl A. Scheidt、William J. Smith
DOI:10.1021/jo0164148
日期:2002.6.1
analysis that permits the stereochemistry of beta-hydroxy ketones to be assigned by visual inspection of the ABX patterns for the alpha-methylene unit of the beta-hydroxy ketone in the 1H NMR spectra. This method has been verified by application to a wide range of beta-hydroxy ketones deriving from aldol reactions of chiral aldehydes with a variety of chiral and achiral methyl ketone enolates (see Tables