Enantiocontrolled construction of bicyclic proline derivatives via one-pot generation and intramolecular trapping of chiral stabilised azomethine ylids
摘要:
Aldehydes possessing unsaturation at C-5 or C-6 condense with (5S)-phenylmorpholin-2-one (1), generating chiral stabilised azomethine ylids which undergo concommitant diastereospecific intramolecular 3+2 dipolar cycloaddition to furnish adducts (2), (4), and (5) which may be converted to homochiral bicyclic proline derivatives. Reductive desulfurisation of the thioether derivative (5) leads to (2S,4R,5R)-4,5-dimethylproline (7).
Fast Ruthenium-Catalysed Allylation of Thiols by Using Allyl Alcohols as Substrates
作者:Alexey B. Zaitsev、Helen F. Caldwell、Paul S. Pregosin、Luis F. Veiros
DOI:10.1002/chem.200900192
日期:2009.6.22
Green and fast: Allylation of aromatic and aliphatic thiols, by usingallylalcohols as substrates, requires only minutes at ambient temperature with a Ru catalyst (see scheme). Quantitative conversion is normal and the catalyst possesses high functional‐group tolerance.
Chemoselective Rearrangement Reactions of Sulfur Ylide Derived from Diazoquinones and Allyl/Propargyl Sulfides
作者:Sijia Yan、Junxin Rao、Cong-Ying Zhou
DOI:10.1021/acs.orglett.0c03493
日期:2020.11.20
three types of rearrangement reactions of sulfur ylidederivedfrom diazoquinones and allyl/propargyl sulfides. With Rh2(esp)2 as the catalyst, diazoquinones react with allyl/propargyl sulfides to form a sulfur ylide, which undergoes a chemoselective tautomerization/[2,3]-sigmatropic rearrangement reaction, a Doyle–Kirmse rearrangement/Cope rearrangement cascade reaction, or a Doyle–Kirmse rearrangement/elimination
(ALLYLTHIO)ACETATE DIANION AS A NEW AND CONVENIENT REAGENT FOR THE STEREOSELECTIVE SYNTHESIS OF (2<i>E</i>,4<i>E</i>)DIENOATES FROM ALKYL HALIDES
作者:Kazuhiko Tanaka、Makoto Terauchi、Aritsune Kaji
DOI:10.1246/cl.1981.315
日期:1981.3.5
Treatment of (allylthio)acetate with lithium diisopropylamide followed by the addition of s-butyllithium produced a new dianion which could react with a variety of alkylhalides exclusively at the allylic position. The high regioselectivity of the allylic alkylation could be realized in the case of methyl (allylthio)acetate dianion. A convenient and general method for the stereoselective synthesis
New Strategies to Cyclic <i>α</i>-Thiophosphonates
作者:Joel D. Moore、Kevin T. Sprott、Paul R. Hanson
DOI:10.1055/s-2001-13374
日期:——
A transition-metal-catalyzed approach to cyclic α-thiophosphonates is reported. This strategy incorporates both a Rh2(OAc)4-catalyzed [2,3]-sigmatropic rearrangement of intermediate sulfur-ylides generated from α-diazophosphonates and a ring-closing metathesis (RCM) of the resulting α-thiophosphonates 2 a - c to yield functionalized cyclic α-thiophosphonates 4 a - c.
报告了一种过渡金属催化的环状δ±-硫代磷酸酯的方法。该策略包括 Rh2(OAc)4 催化的δ-二氮膦酸盐生成的中间硫酰基的[2,3]-三向异性重排,以及由此生成的δ-硫代磷酸盐 2 a - c 的闭环偏析 (RCM),从而生成官能化的环状δ-硫代磷酸盐 4 a - c。
Aluminum-chloride catalyzed reaction of allylic sulfides with methyl propiolate: A novel addition reaction via an ionic [3.3] sigmatropic rearrangement
The aluminum-chloride catalyzed reaction of allylic sulfides with methyl propiolate resulted in the clean formation of novel 1:1 adducts via ionic [3.3] sigmatropic rearrangements.