bioinsipred gold‐catalyzed tandem Diels–Alder/Diels–Alderreaction of an enynal and a 1,3‐diene, forming the highly‐strained benzotricyclo[3.2.1.02,7]octane skeleton, was reported. In contrast, a Diels–Alder/Friedel–Crafts tandem reaction occurred instead when silver salts were used as the catalyst. Although both reactions experienced the similar Diels–Alderreaction of a pyrylium intermediate with a
Catalytic (3+2) Palladium‐Aminoallyl Cycloaddition with Conjugated Dienes
作者:Barry M. Trost、Zhongxing Huang
DOI:10.1002/anie.201900693
日期:2019.5.6
application of tailored aminoallyl precursors for catalytic (3+2) cycloaddition with conjugateddienes via a Pd‐aminoallyl intermediate. The new cycloaddition reactions override the conventional (4+3) selectivity of aminoallyl cation cycloaddition through a sequence of Pd‐allyl transfer and ring closure. A variety of highly substituted or fused pyrrolidine rings were synthesized using the cycloaddition, and can
Nickel-Catalyzed Regioselective Hydrobenzylation of 1,3-Dienes with Hydrazones
作者:Leiyang Lv、Dianhu Zhu、Zihang Qiu、Jianbin Li、Chao-Jun Li
DOI:10.1021/acscatal.9b02483
日期:2019.10.4
Hydroalkylation of unsaturated hydrocarbons with unstabilized carbonnucleophiles is difficult and remains a major challenge. The disclosed examples so far have mainly focused on the involvement of heteroatom and/or stabilized carbonnucleophiles as efficient reaction partners. Reported here is an unprecedented regioselective nickel-catalyzed hydrobenzylation of 1,3-dienes with hydrazones, generated in situ from
Palladium-Catalyzed [4+2] Annulation of Aryl and Alkenyl Carboxamides with 1,3-Dienes via C–H Functionalization: Synthesis of 3,4-Dihydroisoquinolones and 5,6-Dihydropyridinones
作者:Manman Sun、Jinshan Li、Weida Chen、Haijian Wu、Jianguo Yang、Zhiming Wang
DOI:10.1055/s-0039-1690219
日期:2020.4
Palladium-catalyzed [4+2] annulation of aryl and alkenyl carboxamides with 1,3-dienes viaC–Hfunctionalization is developed using air as the terminal oxidant. The method demonstrates good functional group tolerance and high stereoselectivity, affording a series of 3,4-dihydroisoquinolones and 5,6-dihydropyridinones in yields of up to 99%. Palladium-catalyzed [4+2] annulation of aryl and alkenyl carboxamides
Enantioselective Aminomethylamination of Conjugated Dienes with Aminals Enabled by Chiral Palladium Complex-Catalyzed C–N Bond Activation
作者:Yang Liu、Yinjun Xie、Hongli Wang、Hanmin Huang
DOI:10.1021/jacs.6b00976
日期:2016.4.6
A novel highlyenantioselective aminomethylamination of conjugated dienes with aminals catalyzed by a chiral palladium complex ligated with BINOL-derived chiral diphosphinite has been successfully developed. This reaction proceeds via a Pd-catalyzed cascade C-N bond activation, aminomethylation, and asymmetricallylicamination reaction under mild reaction conditions, providing a unique and efficient