Rhodium-Catalyzed Intermolecular Chelation Controlled Alkene and Alkyne Hydroacylation: Synthetic Scope of β-<i>S</i>-Substituted Aldehyde Substrates
作者:Michael C. Willis、Helen E. Randell-Sly、Robert L. Woodward、Steven J. McNally、Gordon S. Currie
DOI:10.1021/jo060582o
日期:2006.7.1
The use of β-S-substituted aldehydes in rhodium-catalyzed intermolecularhydroacylation reactions is reported. Aldehydes substituted with either sulfide or thioacetal groups undergo efficient hydroacylation with a variety of electron-poor alkenes, such as enoates, in Stetter-like processes and with both electron-poor and neutral alkynes. In general, the reactions with electron-poor alkenes demonstrate
1,2,4-Trioxepanes: Redox-Cleavable Protection for Carbonyl Groups
作者:Aqeel Ahmed、Patrick H. Dussault
DOI:10.1021/ol048484h
日期:2004.9.1
[reaction: see text] 1,2,4-trioxepanes, readily prepared and easilyhandled derivatives of aldehydes and ketones, are stable to a variety of synthetic conditions and yet easily deblocked with Zn/HOAc or Mg/MeOH to regenerate the parent carbonyl. Trioxepanes may provide an alternative to 1,3-dithianes for acid-stable protection of carbonyl groups.
COUPLING REACTIONS OF ORGANOALUMINATES WITH ACID CHLORIDES OR ANHYDRIDES CATALYZED BY COPPER COMPOUNDS. A CONVENIENT ROUTE TO KETONES FROM 1-OLEFINS VIA HYDROALUMINATION
作者:Fumie Sato、Hiroyuki Kodama、Yasuji Tomuro、Masao Sato
DOI:10.1246/cl.1979.623
日期:1979.6.5
Hydroalumination of 1-olefins with lithium aluminum hydride followed by treatment with acid chlorides or anhydrides in the presence of a catalytic amount of copper(I) chloride resulted in coupling. This new development provides a simple and general method for the synthesis of ketones.
Efficient Stereoselective Synthesis of Structurally Diverse γ‐ and δ‐Lactones Using an Engineered Carbonyl Reductase
作者:Meng Chen、Xiao‐Yan Zhang、Chen‐Guang Xing、Chao Zhang、Yu‐Cong Zheng、Jiang Pan、Jian‐He Xu、Yun‐Peng Bai
DOI:10.1002/cctc.201900382
日期:2019.6.6
efficiently synthesized stereoselectively using an engineered carbonyl reductase from Serratia marcescens (SmCRV4). SmCRV4 exhibited improved activity (up to 500‐fold) and thermostability toward 14 γ‐/δ‐keto acids and esters, compared with the wild‐type enzyme, with 110‐fold enhancement in catalytic efficiency (kcat/Km) toward methyl 4‐oxodecanoate. The preparative synthesis of alkyl and aromatic γ‐ and δ‐lactones
结构结构多样的γ-和δ-内酯是利用粘质沙雷氏菌(Sm CR V4)中的一种工程化羰基还原酶有效地立体选择性合成的。与野生型酶相比,Sm CR V4表现出更高的活性(最高达500倍)和对14种γ-/δ-酮酸和酯的热稳定性,催化效率提高了110倍(k cat / K m)对4-氧代十二烷甲酸甲酯。证明了烷基和芳香族γ-和δ-内酯的制备合成,其ee率为95%-> 99%,收率为78%-90%。最高时空产量为1175 g L -1 d -1,达到了(R)-γ-癸内酯