Stereoselective Synthesis of Polysubstituted Alkenes through a Phosphine-Mediated Three-Component System of Aldehydes, α-Halo Carbonyl Compounds, and Terminal Alkenes
作者:Da-Neng Liu、Shi-Kai Tian
DOI:10.1002/chem.200900177
日期:2009.4.27
mediate the one‐pot Wittig reaction of aldehydes with α‐halo carbonylcompounds for the synthesis of 1,2‐disubstituted and trisubstituted alkenes in an excellent stereoselective fashion. Furthermore, the first one‐pot, three‐component reaction of aldehydes, α‐halo acetates, and terminalalkenes has been developed in the presence of PPh3 to produce trisubstituted alkenes with excellent E selectivity (see
A Selenourea-Thiourea Brønsted Acid Catalyst Facilitates Asymmetric Conjugate Additions of Amines to α,β-Unsaturated Esters
作者:Yingfu Lin、William J. Hirschi、Anuj Kunadia、Anirudra Paul、Ion Ghiviriga、Khalil A. Abboud、Rachael W. Karugu、Mathew J. Vetticatt、Jennifer S. Hirschi、Daniel Seidel
DOI:10.1021/jacs.9b12457
日期:2020.3.25
enantioselectivity via the conjugate addition of cyclic amines to unactivated α,β-unsaturated esters. A related strategy enables the kineticresolution of racemic cyclic 2-arylamines, using benzyl acrylate as the resolving agent. Reactions are facilitated by an unprecedented selenourea-thiourea organocatalyst. As elucidated by DFT calculations and 13C kinetic isotope effects studies, the rate-limiting and enantiodetermining
Copper-Catalyzed Asymmetric Allylic Alkylation of Halocrotonates: Efficient Synthesis of Versatile Chiral Multifunctional Building Blocks
作者:Tim den Hartog、Beatriz Maciá、Adriaan J. Minnaard、Ben L. Feringa
DOI:10.1002/adsc.201000109
日期:——
The highly enantioselective synthesis of α‐methyl‐substituted esters is reported in up to 90% yield and up to 99% ee using copper‐TaniaPhos as chiral catalyst. The transformation proved scalable to at least 6.6 mmol (1.7 g scale). The products of this transformation have been further elaborated to multifunctionalbuildingblocks with a single (branched esters and acids) or multiple stereogenic centers
Process for Producing an Aromatic Unsaturated Compound
申请人:Wang Weiqi
公开号:US20080221337A1
公开(公告)日:2008-09-11
The present invention provides a process for producing an aromatic unsaturated compound of the formula (4)
wherein Ar represents an optionally substituted aromatic group or an optionally substituted heteroaromatic group, and Y represents an electron withdrawing group,
which comprises reacting
(a) a compound of the formula (1)
Ar—H (1)
wherein Ar has the same meaning as defined above with
(b) a compound of the formula (2)
wherein Y has the same meaning as defined above, and Z represents a lower alkoxy, or
a compound of the formula (3)
wherein Y and Z have the same meanings as defined above, in the presence of
(c) an acid or a compound which generates a mineral acid by its hydrolysis.
PROCESS FOR PRODUCING AN AROMATIC UNSATURATED COMPOUND
申请人:WANG Weiqi
公开号:US20090111999A1
公开(公告)日:2009-04-30
The present invention provides a process for producing an aromatic unsaturated compound of the formula (4)
wherein Ar represents an optionally substituted aromatic group or an optionally substituted heteroaromatic group, and Y represents an electron withdrawing group,
which comprises reacting
(a) a compound of the formula (1)
Ar—H (1)
wherein Ar has the same meaning as defined above
with
(b) a compound of the formula (2)
wherein Y has the same meaning as defined above, and Z represents a lower alkoxy, or
a compound of the formula (3)
wherein Y and Z have the same meanings as defined above,
in the presence of
(c) an acid or a compound which generates a mineral acid by its hydrolysis.