Catalytic asymmetric hydrogenation of indoles using a rhodium complex with a chiral bisphosphine ligand PhTRAP
作者:Ryoichi Kuwano、Manabu Kashiwabara、Koji Sato、Takashi Ito、Kohei Kaneda、Yoshihiko Ito
DOI:10.1016/j.tetasy.2006.01.016
日期:2006.2
Highly enantioselective hydrogenation of N-protected indoles was successfully developed by use of the rhodium catalyst generated in situ from [Rh(nbd)2]SbF6 and the chiralbisphosphine PhTRAP, which can form a trans-chelate complex with a transition metal atom. The PhTRAP–rhodium catalyst required a base (e.g., Cs2CO3) for the achievement of high enantioselectivity. Various 2-substituted N-acetylindoles
通过使用由[Rh(nbd)2 ] SbF 6原位生成的铑催化剂和手性双膦PhTRAP,可以成功地开发出N-保护的吲哚的高度对映选择性氢化反应,可以与过渡金属原子形成反式-螯合物。PhTRAP-铑催化剂需要碱(例如Cs 2 CO 3)才能实现高对映选择性。将各种2-取代的N-乙酰吲哚转化为具有高达95%ee的相应的手性二氢吲哚。3-取代的N - tosylindoles的氢化产生二氢吲哚,其在3-位具有立体异构中心,具有高的对映异构体过量(至多98%ee)。
Enantioselective Synthesis of 2-Bromomethyl Indolines via BINAP(S)-Catalyzed Bromoaminocyclization of Allyl Aniline
作者:Sheng-Nan Yu、Yin-Long Li、Jun Deng
DOI:10.1002/adsc.201700106
日期:2017.7.17
An enantioselective bromoamination of allyl aniline with N‐bromosuccinimide (NBS) catalyzed by BINAP(S) (BINAP monosulfide) is described. This protocol could provide a range of chiral 2‐bromomethyl indolines in good to excellent yields with up to 87% ee. Furthermore, the resulting chiral 2‐bromomethyl indolines could be easily converted into synthetically useful chiral building blocks.
Chiral Indoline Synthesis via Enantioselective Intramolecular Copper-Catalyzed Alkene Hydroamination
作者:Benjamin W. Turnpenny、Kiante L. Hyman、Sherry R. Chemler
DOI:10.1021/om300744m
日期:2012.11.26
An enantioselectivecopper-catalyzedhydroamination/cyclization of N-sulfonyl-2-allylanilines for the synthesis of chiral 2-methylindolines is reported. Chiral 2-methylindolines are important subunits in drugs and bioactive compounds. This method provides chiral N-sulfonyl-2-methylindolines in up to 90% ee.
报道了用于合成手性 2-甲基二氢吲哚的对映选择性铜催化N-磺酰基-2-烯丙苯胺的氢胺化/环化。手性2-甲基二氢吲哚是药物和生物活性化合物中的重要亚基。该方法可提供高达 90% ee 的手性N-磺酰基-2-甲基二氢吲哚。
Catalytic Activation of the Leaving Group in the S<sub>N</sub>2 Reaction
catalytic activation of the leaving group in the S(N)2reaction is achieved as an extension of our mercuric triflate-catalyzed reactions. Derivatives of anilinoethyl 4-pentynoate reacted smoothly with catalytic amounts of Hg(OTf)(2) to give indoline derivatives in excellent yield with efficient catalytic turnovers under very mild conditions. The reaction of optically pure secondary alcohol derivatives