Ionic ‘Diels–Alder’ reactions of hexa-3,5-dienyl trimethylsilyl ether and enones: X-ray structural determination of adduct stereostructure, and a stereoselective approach to trans-fused octalin systems
作者:Richard K. Haynes、Kwok-Ping Lam、Ian D. Williams、Lam-Lung Yeung
DOI:10.1039/c39950002479
日期:——
The trimethylsilyl (TMS) and tert-butyldimethylsilyl (TBDMS) ethers of hexa-3,5-dien-1-ol react with cyclohexenones and an acyclic enone, methyl vinyl ketone (MVK), in the presence of 5â10 mol% of Me3SiOSO2CF3(TMSOTf) in MeCN to provide trans-fused adducts arising via ionic (Gassman-type) DielsâAlder reactions; structural confirmation for adduct stereochemistry for this type of reaction is provided by an X-ray structural determination.
Catalytic Asymmetric Synthesis of Cyclic Sulfamides from Conjugated Dienes
作者:Richard G. Cornwall、Baoguo Zhao、Yian Shi
DOI:10.1021/ol303469a
日期:2013.2.15
This paper describes the catalytic asymmetric diamination of alkyl dienesusing N,N′-di-tert-butylthiadiaziridine 1,1-dioxide in the presence of Pd(0) and a chiral phosphoramidite ligand to give cyclic sulfamides in high yield and high ee. The diamination is also amenable to gram scale.
本文描述了在 Pd(0) 和手性亚磷酰胺配体存在下使用N , N '-二叔丁基噻二氮丙啶 1,1-二氧化物催化不对称二烯二胺化,以高产率和高 ee 得到环状磺酰胺。该二胺化也适合克级规模。