The first example of aldol reactions between trimethylsilyl enol ethers and aldehydes by the aid of rhodium complex
作者:Susumu Sato、Isamu Matsuda、Yusuke Izumi
DOI:10.1016/s0040-4039(00)85255-7
日期:1986.1
Crossed aldolreaction of trimethylsilyl enol ether with aldehyde is successfully performed with the aid of catalytic amount of rhodium complex, [(COD)Rh(DPPB)]+X− (X = PF6 and ClO4) or Rh4(CO)12, under neutral conditions.
的交叉醛醇缩合反应三甲基硅烯醚与醛可以成功地与铑配合物,[(COD)的Rh(DPPB)]的催化量的帮助下执行+ X -(X = PF 6和C10 4)或Rh 4(CO)12,在中性条件下。
Crossed aldol-type reactions catalyzed by rhodium complexes
作者:Susumu Sato、Isamu Matsuda、Yusuke Izumi
DOI:10.1016/0022-328x(88)83037-7
日期:1988.9
ketones. Rh4(CO)12 and [Rh(COD)(DPPB)]ClO4 also catalyze the reaction of enol trimethylsilyl with acetals or ketals, whereas [Rh(COD)(DPPB)PF6 does not. When [Rh(COD)(DPPB)ClO4 is used as the catalyst, this type of aldol reaction is extended to the one-potsynthesis of trisubstituted furans from enol trimethylsilyl ether and α-trimethylsiloxy acetal.
study, affording the aldol product with excellent diastereo- and enantioselectivities, these two catalysts generating opposite enantiomers. Water affects the selectivity, and poor results are obtained under neat reaction conditions or in dry organic solvents. More than three equivalents of water are required for the best diastereo- and enantioselectivities, while three equivalents is the recommended amount
The present invention relates to a process for producing 2-alkylcycloalkanones with a high yield and a high purity. In addition, the present invention also relates to a process for producing lactones as a useful perfume material for cosmetics, flavors, etc. More specifically, the present invention relates to a process for producing a 2-alkylcycloalkanone represented by the following general formula (2) which includes the step of subjecting a 2-(1-hydroxyalkyl)-cycloalkanone to dehydration and hydrogenation reaction in a flow of a hydrogen gas under a pressure of from 20 to 200 kPa (absolute pressure) in the presence of an acid and a platinum group metal catalyst; and a process for producing a lactone which includes the step of subjecting the 2-alkylcycloalkanone to oxidation reaction using a percarboxylic acid:
wherein n is an integer of 1 or 2; and R1 and R2 are each independently a hydrogen atom or an alkyl group having 1 to 8 carbon atoms with the proviso that R1 and R2 may form a ring through a carbon atom adjacent thereto.