Asymmetric induction in the addition reactions of chiral sulfinylallyl anions (ambident nucleophiles) with enones (ambident electrophiles). Ring closure of enol thioether ketones
Asymmetric synthesis of chiral sulfoxides and sulfinimines by using N-sulfinylsultam
摘要:
Bornane-10,2-sultam 1 is stereoselectively converted by DMAP-assisted sulfinylation to diastereomerically pure (2R)-N-[(R)-p-tolylsulfinyl]-bornane-10,2-sultam 2 in 77% yield. The crystalline sulfinylating agent 2 reacts with a variety of nucleophiles to afford sulfoxides 3 and sulfinimines 5 in excellent yields and enantioselectivities. (C) 1997 Elsevier Science Ltd.
application of allylic sulphoxides and, particularly, the chiralamine reagent tert-butanesulphinamide has been extended to three different tandem processes. The condensation of (R)-(+)-allyl p-tolyl sulphoxide, fluorinated nitriles and alkyl propiolates led to a new family of enantiomerically pure fluorine-containing 1,4- dihydropyridines. A diastereoselective nucleophilic addition of fluorinated nucleophiles
Preliminary results concerning a conceptually novel route to chiral sulfoxides based on the asymmetric alkylation of sulfenate salts with alkyl halides mediated by a chiral phase-transfer catalyst are described. As a representative example, o-anisyl methyl sulfoxide was produced in 96% yield and with an enantiomeric excess of 58% using commercial cinchonidinium derivative 2a.
Incubation of alkyl aryl and allyl aryl sulfides with growing cells of Corynebaoterium equi IFO 3730 gave the corresponding opticallyactivesulfoxides of high enantiomeric excess.
Asymmetric synthesis via chiral sulfinylallyl anion. Total synthesis of (+)-hirsutene: facile ring closure involving enol thioether and enol acetate moieties
作者:Duy H. Hua、Gurudas Sinai-Zingde、S. Venkataraman
DOI:10.1021/ja00299a061
日期:1985.6
A concise synthesis of homochiral trans-perhydroazulenes and trans-hydrindanes
作者:D.Neville Jones、Mark W.J Maybury、Steven Swallow、Nicholas C.O Tomkinson、William W Wood
DOI:10.1016/s0040-4039(01)00102-2
日期:2001.3
A new approach to the synthesis of optically pure trans-perhydroazulenes and trans-hydrindanes using a homochiral sulfoxide auxiliary to control both chemical reactivity and enantioselectivity is described. (C) 2001 Elsevier Science Ltd. All rights.