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- Title
Iridium‐Catalyzed Chemo‐, Diastereo‐, and Enantioselective Allyl‐Allyl Coupling: Accessing All Four Stereoisomers of (E)‐1‐Boryl‐Substituted 1,5‐Dienes by Chirality Pairing.
- Authors
Jung, Yongsuk; Yoo, Seok Yeol; Jin, Yonghoon; You, Jaehyun; Han, Seungcheol; Yu, Jeongwoo; Park, Yoonsu; Cho, Seung Hwan
- Abstract
Here, we report a highly chemo‐, diastereo‐, and enantioselective allyl‐allyl coupling between branched allyl alcohols and α‐silyl‐substituted allylboronate esters, catalyzed by a chiral iridium complex. The α‐silyl‐substituted allylboronate esters can be chemoselectively coupled with allyl electrophiles, affording a diverse set of enantioenriched (E)‐1‐boryl‐substituted 1,5‐dienes in good yields, with excellent stereoselectivity. By permuting the chiral iridium catalysts and the substrates, we efficiently and selectively obtained all four stereoisomers bearing two consecutive chiral centers. Mechanistic studies via density functional theory calculations revealed the origins of the diastereo‐ and chemoselectivities, indicating the pivotal roles of the steric interaction, the β‐silicon effect, and a rapid desilylation process. Additional synthetic modifications for preparing a variety of enantioenriched compounds containing contiguous chiral centers are also included.
- Subjects
IRIDIUM catalysts; STEREOISOMERS; CHIRAL centers; CHIRALITY; DENSITY functional theory; ALLYL alcohol; DIELS-Alder reaction; CLAISEN rearrangement
- Publication
Angewandte Chemie, 2023, Vol 135, Issue 13, p1
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202218794