Continuous Flow
<i>Z</i>
‐Stereoselective Olefin Metathesis: Development and Applications in the Synthesis of Pheromones and Macrocyclic Odorant Molecules**
作者:Jennifer Morvan、Tom McBride、Idriss Curbet、Sophie Colombel‐Rouen、Thierry Roisnel、Christophe Crévisy、Duncan L. Browne、Marc Mauduit
DOI:10.1002/anie.202106410
日期:2021.9
The first continuous flow Z-selective olefinmetathesis process is reported. Key to realizing this process was the adequate choice of stereoselective catalysts combined with the design of an appropriate continuous reactor setup. The designed continuous process permits various self-, cross- and macro-ring-closing-metathesis reactions, delivering products in high selectivity and short residence times
报道了第一个连续流动 Z-选择性烯烃复分解过程。Key to realizing this process was the adequate choice of stereoselective catalysts combined with the design of an appropriate continuous reactor setup. 设计的连续工艺允许各种自、交叉和大环闭环复分解反应,以高选择性和短停留时间提供产品。该技术通过直接应用于一系列信息素和大环气味分子的制备来举例说明,并在一个伸缩的 Z 选择性交叉复分解/迪克曼环化序列中达到高潮,以获取 ( Z )-Civetone,并结合一系列连续搅拌罐反应堆。
作者:Mohasin Momin、Gergely M. Nagy、Michael R. Buchmeiser
DOI:10.1002/adsc.201900979
日期:2019.12.17
i. e. of [Mo(N‐2‐tert‐butyl‐C6H4) (CHCMe2Ph)(NHC)X+ B(ArF)4−] (NHC=1,3‐di(2‐Pr)imidazol‐2‐ylidene (iPr), 1,3‐dimesitylimidazol‐2‐ylidene (IMes); X=pyrrolide, OCH(CF3)2, B(ArF)4−=tetrakis(3,5‐bis(trifluoromethyl)phenyl)borate) and of [Mo(N‐3,5‐Me2‐C6H3)(CHCMe2Ph)(NHC)(CH3CN)X+ B(ArF)4−] (NHC=1,3‐dimesitylimidazol‐2‐ylidene, 1,3‐dimesitylimidazolin‐2‐ylidene (IMesH2); X=CF3SO3, OCPh(CF3)2) on E/Z‐selectivity
阳离子钼亚胺基亚烷基N杂环卡宾(NHC)催化剂的结构影响,i。e。的[沫(N-2-叔丁基-C 6 H ^ 4)(CHCMe 2 PH)(NHC)X + B(氩˚F)4 - ](NHC = 1,3-二(2-PR)咪唑咪唑-2-亚基(我PR),1,3- diMESitylimidazol -2-亚基(IMES); X =吡咯,OCH(CF 3)2,B(AR ˚F)4 - =四(3,5-双(三氟甲基) )和([Mo(N-3,5-Me 2 -C 6 H 3)(CHCMe 2Ph)(NHC)(CH 3 CN)X + B(Ar F)4 − ](NHC = 1,3-二甲酰亚胺基-2-亚基,1,3-二咪唑啉-2-基(IMESH 2); X = CF 3 SO 3,OCPh(CF 3)2)对内,内-2,3-二苯甲氧基降冰片烯5-内烯(内,内-DCMNBE)的开环交叉复分解(ROCM)的E / Z选择性,exo,exo
A Highly Selective Synthesis of Dialkenyl Sulfones via Cross-Metathesis of Divinyl Sulfone
作者:Michal Bieniek、Dariusz Kołoda、Karol Grela
DOI:10.1021/ol061991+
日期:2006.12.1
Catalytic cross-metathesis of commercial divinyl sulfone allowed direct access to novel (E)-alkenylvinyl sulfones and (E,E)-dialkenyl sulfones with excellent stereoselectivity. These compounds are useful building blocks, e.g., in the synthesis of substituted thiomorpholine 1,1-dioxidederivatives. [reaction: see text]
or gold(I) chlorides promotes the rapid trapping of one NHCligand, which releases the catalytically active Ru-species. Impressive initiation rates with full-conversions are observed within one minute. This practical protocol demonstrates excellent catalytic performances in various ring-closingmetathesis (RCM) and self-metathesis (SM) reactions.