Bicyclooctanes: cis-bicyclo[3.3.0]octa-2,6 and 2,7-diene-2-carboxylic acids
作者:James K. Whitesell、Mark A. Minton、William G. Flanagan
DOI:10.1016/0040-4020(81)80012-9
日期:1981.1
Two independent routes to each of the title acids, useful in the synthesis of natural products, are presented. The sequences commence with readily available materials which are amenable to the preparation of multigram quantities. Complete 13C spectral data is supplied for intermediates and products.
Chemoselectivity in molybdenum catalyzed alcohol and aldehyde oxidations
作者:Barry M. Trost、Yoshiro Masuyama
DOI:10.1016/s0040-4039(00)99832-0
日期:1984.1
Hydrogen peroxide in the presence of (NH4)6Mo7O24 · 4H2O and potassium carbonate is a chemoselective method to oxidize secondary alcohols to ketones and to oxidize aldehydes to acids, the latter also accelerated by cerium chloride.
在(NH 4)6 Mo 7 O 24 ·4H 2 O和碳酸钾存在下的过氧化氢是一种化学选择方法,可将仲醇氧化为酮,并将醛氧化为酸,后者也可通过氯化铈加速。
Palladium-Catalyzed Carbonylative Heck-Type Reactions of Alkyl Iodides
作者:Kayla S. Bloome、Erik J. Alexanian
DOI:10.1021/ja1053913
日期:2010.9.22
A palladium-catalyzed carbonylative Heck-type cyclization of alkyl halides is described. Treatment of a range of primary and secondary alkyliodides with catalytic palladium(0) under CO pressure forms a variety of synthetically versatile enone products. The reactivity described represents a rare example of a palladium-catalyzedHeck-type cyclization involving unactivatedalkyl halides with β-hydrogens
描述了烷基卤化物的钯催化羰基化 Heck 型环化。在 CO 压力下用催化钯 (0) 处理一系列伯和仲烷基碘,形成各种合成通用的烯酮产品。所描述的反应性代表了钯催化的 Heck 型环化的一个罕见例子,涉及未活化的烷基卤与 β-氢。烯烃取代具有良好的耐受性,并且可以轻松获得单环和双环碳环。
Lipase-Catalyzed Regioselective Monoacetylation of Unsymmetrical 1,5-Primary Diols
Lipase B from Candida antarctica (CALB) has been selected as the most suitable enzyme to catalyze the regioselective monoacetylation of 1,5-diol isoprostane intermediate, using vinyl acetate as an acyl transfer reagent in THF. We next applied this reaction on linear 2-substituted, 2,2′-disubstituted-1,5-pentanediols, and cyclic 2,3-disubstituted-1,5-pentanediols. To rationalize the regioselectivity
Total synthesis of (±)-allamcin. An approach TC antileukaemic iridoid lactones.
作者:Kevin E.B. Parkes、Gerald Pattenden
DOI:10.1016/s0040-4039(00)84244-6
日期:1986.1
A totalsynthesis of (±)-allamcin(1), which also constitutes formal syntheses of plumericin(2) and allamandin(3) found in Allamanda neriifolia, is described.