Z-Enolate Geometry in the Thioamide Aldol Reaction Illuminated by the 7-Azaindoline Auxiliary

Roman Pluta, Zhao Li, Naoya Kumagai, Masakatsu Shibasaki

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Z or E enolate geometry is the primary determinant of diastereoselectivity in the aldol reaction. Although amide and thioamide enolates are anticipated to have predominantly the E geometry because of the intrinsic steric demand, spectroscopic confirmation of the geometry in solution has remained elusive, particularly in the realm of highly stereoselective catalytic asymmetric aldol reactions. Herein we demonstrate that the 7-azaindoline auxiliary enables direct observation of the exclusive formation of the Z-enolate of the thioamide en route to a highly syn-selective aldol reaction.

Original languageEnglish
Pages (from-to)791-794
Number of pages4
JournalOrganic Letters
Volume22
Issue number3
DOIs
Publication statusPublished - 2020 Feb 7
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Physical and Theoretical Chemistry
  • Organic Chemistry

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