Copper-Catalyzed Oxy-Alkenylation of Homoallylic Alcohols to Generate Functional<i>syn</i>-1,3-Diol Derivatives
作者:Dean Holt、Matthew J. Gaunt
DOI:10.1002/anie.201501995
日期:2015.6.26
functionalized 1,3‐diol derivatives is reported. Employing a copper‐catalyzed oxy‐alkenylation strategy, a range of readily available, substituted homoallylic alcohol derivatives and alkenyl(aryl) iodonium salts combine to form syn‐1,3‐carbonates in excellent yield and with high selectivity. Furthermore, the products formed are amenable to an iterative reaction sequence, thus affording highly complex polyketide‐like
Alkynyliodonium Salts in Organic Synthesis. Application to the Total Synthesis of (−)-Agelastatin A and (−)-Agelastatin B
作者:Ken S. Feldman、Joe C. Saunders
DOI:10.1021/ja027121e
日期:2002.8.1
The asymmetric total syntheses of (-)-agelastatin A and (-)-agelastatin B were accomplished in 14 steps each from (R)-epichlorohydrin. The pivotal transformation in both sequences was a sulfinate-promoted cyclization of an alkynyliodonium salt to furnish a key functionalized cyclopentene intermediate. Selective bromination in the final step led to either agelastatin A or agelastatin B, depending upon
(-)-agelastatin A 和 (-)-agelastatin B 的不对称全合成分别从 (R)-表氯醇分 14 个步骤完成。两个序列中的关键转化是亚磺酸盐促进的炔基碘盐环化,以提供关键的官能化环戊烯中间体。根据条件,最后一步中的选择性溴化导致agelastatin A 或agelastatin B。
Stereoselectivity in Trimethylenemethane (TMM) Diyl Mediated Cycloaddition Reaction to Angularly Fused Triquinanes
作者:Yeokwon Yoon、Taek Kang、Hee-Yoon Lee
DOI:10.1002/asia.201000672
日期:2011.2.1
the TMMdiylmediated [2+3] cycloadditionreaction of monosubstituted linear substrates to form angularlyfusedtriquinanes was carried out. Substitution at position 3 provided complete diastereoselectivity, while positions 1 and 4 induced marginal stereoselectivity. Position 2 did not show any influence on the diastereoselectivity. Position 4 turned out to be incompatible with the cycloaddition reaction
Alkynyliodonium Salts in Organic Synthesis. Preparation of Annelated Dihydropyrroles by Cascade Addition/Bicyclization of Dienyltosylamide Anions with Phenyl(propynyl)iodonium Triflate
作者:Ken S. Feldman、David. A. Mareska
DOI:10.1021/jo9907538
日期:1999.7.1
The addition of simple pentadienyltosylamide derivatives to the two-carbon electrophile phenyl(propynyl)iodonium triflate initiates a sequence of transformations that furnishes complex, highly functionalized cyclopentenannelated dihydropyrrole products in moderate yields with complete stereoselection. This sequence demonstrates that diyls resulting from homolytic scission of alkylidene carbene-alkene
[reaction: see text] A convenient method for the preparation of 2,5-dihydrofurans by using the chemistry of alkynyl(phenyl)iodonium salts is reported. Treatment of 3-alkoxy-1-alkynyl(phenyl)iodonium triflates with sodium benzenesulfinate generates an alkylidenecarbene, which undergoes [1,5]-C-H insertion to form 2-substituted 4-benzenesulfonyl-2,5-dihydrofurans in reasonable yield. These cyclic vinyl