Catalytic Asymmetric Radical-Mediated Three-Component Piancatelli-Type Rearrangement of Furylalkenes
作者:Lei Xu、Sishi Zhong、Qian Yang、Jie Wei、Jiaming Zou、Hongxiang Li、Yunfei Cai
DOI:10.1021/acscatal.1c03119
日期:2021.8.20
reaction mainly relies on the use of α-furylcarbinols and is initiated by an acid-promoted dehydroxylation process and limited to a two-component manner. In this work, the first asymmetric radical-mediatedthree-component Piancatelli-type rearrangement of furylalkenes with diverse carbon-centered radical precursors and anilines is developed via the combination of copper(I) or photoredox catalysis with chiral
developed a new methodology for the asymmetric Reformatsky-type reaction of (−)-menthyl bromodifluoroacetate (2) with imine in the presence of RhCl(PPh3)3. Ester 2 with the cost-effective chiralauxiliary gave (S)-difluoro-β-lactams in moderate to good yields and high diastereoselectivities through spontaneous removal of the auxiliary.
Visible-light-enabled ruthenium-catalyzed para-C−H difluoroalkylation of anilides
作者:Yaohang Cheng、Xian Zhang、Guanghui An、Guangming Li、Zhenyu Yang
DOI:10.1016/j.cclet.2022.06.048
日期:2023.3
Visible-light-mediated para-C–H difluoroalkylation of anilides via combination of steric effects and Lewis acid activation strategies has been developed. The addition of (C6H5O)2P(O)OH and Ag2CO3 properly tune the redox potential of ruthenium catalyst and leads to mild reaction conditions. The protocol exhibits broad functional group tolerance and allows the late-stage functionalization of complex
已经开发了通过空间位阻效应和路易斯酸活化策略的组合对苯胺的可见光介导的对-C-H二氟烷基化。(C 6 H 5 O) 2 P(O)OH 和 Ag 2 CO 3的添加适当地调节了钌催化剂的氧化还原电位并导致温和的反应条件。该协议表现出广泛的官能团耐受性,并允许复杂生物活性分子的后期功能化。
Salt-stabilized alkylzinc pivalates: versatile reagents for cobalt-catalyzed selective 1,2-dialkylation
作者:Jie Lin、Kaixin Chen、Jixin Wang、Jiawei Guo、Siheng Dai、Ying Hu、Jie Li
DOI:10.1039/d3sc02345a
日期:——
The construction of Csp3–Csp3 bonds through Negishi-type reactions using alkylzinc reagents as the pronucleophiles is of great importance for the synthesis of pharmaceuticals and agrochemicals. However, the use of air and moisture sensitive solutions of conventional alkylzinc halides, which show unsatisfying reactivity and limitation of generality in twofold Csp3–Csp3 cross-couplings, still represents