Stereoselective Alkylation of (S)-N-Acyl-4-isopropyl-1,3-thiazolidine-2-thiones Catalyzed by (Me3P)2NiCl2
摘要:
The structurally simple (Me3P)(2)NiCl2 complex catalyzes S(N)1-type alkylations of chiral N-acyl thiazolidinethiones with diarylmethyl methyl ethers and other stable carbenium cations. The former can contain a variety of functional groups and heteroatoms at the alpha-position. The resultant adducts are isolated as single diastereomers in high yields and can be converted into enantiomerically pure derivatives in a straightforward manner.
Stereoselective Synthesis of the C9–C19 Fragment of Peloruside A
作者:Stuart C. D. Kennington、Juan M. Romo、Pedro Romea、Fèlix Urpí
DOI:10.1021/acs.orglett.6b01428
日期:2016.6.17
A concise synthesis of the C9–C19 fragment of peloruside A that is both highly stereoselective and efficient is described. Achieving an overall yield of 23% over 14 steps, this synthesis not only is high yielding but also involves four chromatography steps. This approach is based on the addition of metal enolates of chiral auxiliary scaffolds generated by either catalytic or stoichiometric amounts
Diastereoselective and Catalytic α-Alkylation of Chiral <i>N</i>-Acyl Thiazolidinethiones with Stable Carbocationic Salts
作者:Stuart C. D. Kennington、Mònica Ferré、Juan Manuel Romo、Pedro Romea、Fèlix Urpí、Mercè Font-Bardia
DOI:10.1021/acs.joc.7b00657
日期:2017.6.16
nickel-catalyzed alkylation of chiral N-acyl-4-isopropyl-1,3-thiazolidine-2-thiones using a commercially available nickel(II) complex, (Me3P)2NiCl2, has been developed for tropylium and trityl tetrafluoroborate salts. The reaction provides a single diastereomer of the corresponding adducts in good to high yields, which, in turn, can be easily converted into a wide array of enantiomerically pure compounds that
Stereoselective Synthesis of the Western Hemisphere of Salinomycin
作者:Igor Larrosa、Pedro Romea、Fèlix Urpí
DOI:10.1021/ol052900w
日期:2006.2.1
[structure: see text]. A convergent and module-based strategy for the asymmetric synthesis of the western hemisphere (C1-C17 fragment) of salinomycin has been devised. This new synthetic approach relies on highlystereoselective C-glycosidation and aldol processes.
Stereoselective Alkylation of (<i>S</i>)-<i>N</i>-Acyl-4-isopropyl-1,3-thiazolidine-2-thiones Catalyzed by (Me<sub>3</sub>P)<sub>2</sub>NiCl<sub>2</sub>
作者:Javier Fernández-Valparís、Juan Manuel Romo、Pedro Romea、Fèlix Urpí、Hubert Kowalski、Mercè Font-Bardia
DOI:10.1021/acs.orglett.5b01626
日期:2015.7.17
The structurally simple (Me3P)(2)NiCl2 complex catalyzes S(N)1-type alkylations of chiral N-acyl thiazolidinethiones with diarylmethyl methyl ethers and other stable carbenium cations. The former can contain a variety of functional groups and heteroatoms at the alpha-position. The resultant adducts are isolated as single diastereomers in high yields and can be converted into enantiomerically pure derivatives in a straightforward manner.