无保护基团转化是原子经济有机合成中一个具有挑战性和重要的问题。η(6)-芳烃/N-Me-磺酰二胺-Ru(II)-BF4 配合物催化2-取代的未保护吲哚在弱酸性六氟异丙醇中的不对称氢化得到具有高达>99% ee 的旋光二氢吲哚化合物。在温和的反应介质下,吲哚上的卤素原子和合成上重要的保护基团(例如甲硅烷基醚、缩醛、苄基醚和酯)得以保留,这有利于进一步合成复杂的二氢吲哚分子。
无保护基团转化是原子经济有机合成中一个具有挑战性和重要的问题。η(6)-芳烃/N-Me-磺酰二胺-Ru(II)-BF4 配合物催化2-取代的未保护吲哚在弱酸性六氟异丙醇中的不对称氢化得到具有高达>99% ee 的旋光二氢吲哚化合物。在温和的反应介质下,吲哚上的卤素原子和合成上重要的保护基团(例如甲硅烷基醚、缩醛、苄基醚和酯)得以保留,这有利于进一步合成复杂的二氢吲哚分子。
A silver Lewis acid catalyzes dearomative [2π+2σ] cycloadditions of N-unprotected indoles and bicyclobutanes to afford indoline fused bicyclo[2.1.1]hexanes (BCHs) bearing up to four contiguous quaternary carbon centers in high yields and with an opposite regioselectivity compared to the classical pathway.
Palladium-Catalyzed Direct 2-Alkylation of Indoles by Norbornene-Mediated Regioselective Cascade C–H Activation
作者:Lei Jiao、Thorsten Bach
DOI:10.1021/ja2055066
日期:2011.8.24
A palladium-catalyzed direct 2-alkylation reaction of free N-H indoles has been developed. This reaction relies on a norbornene-mediated cascade C-H activation process at the indole ring, which features high regioselectivity and excellent functional group, tolerance. The reaction represents the first example for a generally applicable, direct C-H alkylation of indole at the 2-position.
Regioselective Direct C–H Alkylation of NH Indoles and Pyrroles by a Palladium/Norbornene-Cocatalyzed Process
作者:Thorsten Bach、Lei Jiao
DOI:10.1055/s-0033-1338523
日期:——
Nitrogen-containing heterocycles, including 1H-indoles and electron-deficient 1H-pyrroles, undergo a palladium/norbornene-cocatalyzed regioselective alkylation at the C-H bond adjacent to the NH group. A primary alkyl halide is used as the electrophile and the reaction proceeds smoothly under mild conditions to give 2-alkyl-1H-indoles and 2-substituted or 2,3-disubstituted 5-alkyl-1H-pyrroles in good yields.
Asymmetric Hydrogenation of Unprotected Indoles Catalyzed by η<sup>6</sup>-Arene/<i>N</i>-Me-sulfonyldiamine–Ru(II) Complexes
作者:Taichiro Touge、Takayoshi Arai
DOI:10.1021/jacs.6b06295
日期:2016.9.7
Protecting-group-free transformation is a challenging and important issue in atom-economical organic synthesis. The η(6)-arene/N-Me-sulfonyldiamine-Ru(II)-BF4 complex-catalyzed asymmetric hydrogenation of 2-substituted unprotected indoles in weakly acidic hexafluoroisopropanol gives optically active indoline compounds with up to >99% ee. Under mild reaction media, halogen atoms and synthetically important
无保护基团转化是原子经济有机合成中一个具有挑战性和重要的问题。η(6)-芳烃/N-Me-磺酰二胺-Ru(II)-BF4 配合物催化2-取代的未保护吲哚在弱酸性六氟异丙醇中的不对称氢化得到具有高达>99% ee 的旋光二氢吲哚化合物。在温和的反应介质下,吲哚上的卤素原子和合成上重要的保护基团(例如甲硅烷基醚、缩醛、苄基醚和酯)得以保留,这有利于进一步合成复杂的二氢吲哚分子。