Highly Enantioselective and Regioselective Substitution of Morita–Baylis–Hillman Carbonates with Nitroalkanes
作者:Guo-Ying Chen、Fangrui Zhong、Yixin Lu
DOI:10.1021/ol202555v
日期:2011.11.18
A highly enantioselective and regioselectivesubstitution reaction of the Morita–Baylis–Hillman (MBH) carbonates with nitroalkanes catalyzed by a quinidine-derived tertiary amine–thiourea catalyst has been developed. The described method, which is different from most organocatalytic allylicsubstitutions of the MBH adducts to date, represents a novel approach to regioselectively functionalize the MBH
Cooperative Rh(II)/Pd(0) Dual Catalysis: Synthesis of Highly Substituted 3(2<i>H</i>)-Furanones with a C2-Quaternary Center via a Cyclization/Allylic Alkylation Cascade of α-Diazo-δ-keto-esters
cyclization/allylic alkylation cascade of stable α-diazo-δ-keto-esters has been developed. Highly substituted 3(2H)-furanones with a C2-quaternary center can be obtained efficiently under mild conditions via one-pot synthesis. Remarkably, this binary catalytic system shows high chemo-, regio-, and stereoselectivity and excellent tolerance to various functionalities.
In this paper, phosphine‐catalyzed [3 + 3] annulation of Morita–Baylis–Hillman carbonates with C,N‐cyclic azomethine imines has been achieved. The reaction worked smoothly under mild conditions to afford 4,6,7,11b‐tetrahydro‐1H‐pyridazino[6,1‐a]isoquinoline derivatives in high yields with good to excellent diastereoselectivities.
A silver/palladium relay catalyzed 1,3-dipole annulation/allylation reaction of iminoesters and Baylis-Hillman acetates for the construction of fully substituted allyl imidazolidines is reported. The reaction of both iminoesters and Baylis-Hillman acetates affords the fully substituted allyl imidazolidines in high yields and regioselectivities. The three component reaction is triggered by silver-catalyzed
Asymmetric P−C Bond Formation: Diastereoselective Synthesis of Adjacent P,C-Stereogenic Allylic Phosphorus Compounds
作者:Peizhong Xie、Lei Guo、Lanlan Xu、Teck-Peng Loh
DOI:10.1002/asia.201600108
日期:2016.5.6
A novel catalytic asymmetric P−C bond formation between phosphinates/phosphine oxide and allylic carbonates was developed. This methodology could not only afford a variety of functionalized adjacent P,C‐stereogenic phosphorus compounds in high yields with high regio‐ and diastereoselectivities but also provide an alternative strategy to access enantiomerically enriched (SP)‐phosphinates through kinetic