Gold(I)-Catalyzed Cascade Cyclization Reaction: Highly Regio- and Diastereoselective Intermolecular Addition of Water and Alcohols to Epoxy Alkynes
作者:Lun-Zhi Dai、Ming-Juan Qi、Yong-Ling Shi、Xu-Guang Liu、Min Shi
DOI:10.1021/ol0713640
日期:2007.8.1
have developed a novel access to ketal skeletons through a highly regio- and diastereoselective intermolecular addition of water and alcohols to alkynyl epoxides catalyzed by gold(I). This procedure involves a domino three-membered ring-opening, 6-exo-cycloisomerization, and subsequent intra- or intermolecular nucleophilic addition to a double-bond sequence.
Oxidative rearrangement of 2-alkoxy-3,4-dihydro-2H-pyrans: stereocontrolled synthesis of 4,5-cis-disubstituted tetrahydrofuranones including whisky and cognac lactones and crobarbatic acid
Oxidation of 2-alkoxy-3,4-dihydro-2H-pyrans 3 with dimethyldioxirane or MTO/urea–H2O2 followed by Jones oxidation leads to rearrangement and stereocontrolled formation of 4,5-cis-disubstituted tetrahydrofuranones. The method is applied to the synthesis of the whisky lactone 9, cognac lactone 10 and crobarbatic acid 17.
用二甲基二环氧乙烷或MTO /脲-H 2 O 2氧化2-烷氧基-3,4-二氢-2 H-吡喃3,然后进行琼斯氧化,导致4,5-顺式-二取代的四氢呋喃酮的重排和立体形成。该方法适用于威士忌内酯9,白兰地内酯10和巴巴果酸17的合成。
Extension de la reaction de Wittig: Condensation “d'ylures enolates” sur les cetones aliphatiques
作者:C. Broquet
DOI:10.1016/s0040-4020(01)93522-7
日期:1973.1
the reaction of HMPT-Li with the benzoylmethylenetriphenylphosphorane Ph3PCHCOPh reacts with aliphatic ketones, in contrast to its precursor. This condensation makes it possible to prepare β,γ-unsaturated ketones, of type RCHC(R′)CH2COPh, instead of the α,βisomer usually obtained in a Wittig reaction.
HMPT-Li与苯甲酰基亚甲基三苯基膦烷Ph 3PphenylCHCOPh反应制得的烯醇盐内酯Ph 3 P + C - C(Ph)O - Li +与脂族酮反应,与其前体相反。该缩合使得能够制备β,γ不饱和酮,型RCHC(R')CH的2 COPh,代替α,β在维蒂希反应通常同分异构体而获得。
Direct Site-Specific and Highly Enantioselective γ-Functionalization of Linear α,β-Unsaturated Ketones: Bifunctional Catalytic Strategy
作者:Dongxu Yang、Linqing Wang、Fengxia Han、Depeng Zhao、Bangzhi Zhang、Rui Wang
DOI:10.1002/anie.201301146
日期:2013.6.24
α, β, γ: The title method employs a Mg/L catalyst, which is well suited for the selective γ deprotonation and activation of linearα,β‐unsaturated ketones for reaction with nitroalkenes. The reaction leads to a series of optically active cyclohexene ring systems bearing multiple functional groups, systems which are not easily accessible using other methodologies.
One Pot Synthesis of α,β-Unsaturated Ketones from the Mukaiyama Aldol Condensation
作者:Ezzeddine Bouhlel、Béchir Ben Hassine
DOI:10.1080/00397919208019070
日期:1992.8
Abstract Satisfactory yields of α,β-unsaturatedketones are obtained from two trimethylsilylenol ethers and a variety of aldehydes and ketones in a onepot modified Mukaiyama aldol procedure using triethylamine and trifluoroacetic anhydride.