Regioselective Synthesis of Indenols via Nickel-Catalyzed Carbocyclization Reaction
作者:Dinesh Kumar Rayabarapu、Chun-Hui Yang、Chien-Hong Cheng
DOI:10.1021/jo0346508
日期:2003.8.1
degrees C to afford the corresponding indenol derivatives 3a-m with remarkable regioselectivity in good to excellent yields. The nickel-catalyzed carbocyclization reaction was successfully extended to other simple disubstituted alkynes. Thus, the reaction of 2-halophenyl ketones 1a-e with disubstituted alkynes (2h, PhC[triple bond]CPh; 2i, CH(3)C(6)H(4)C[triple bond]CC(6)H(4)CH(3); 2j, CH(3)CH(2)C[triple
2-卤代苯基酮1a-e(1a,o-IC(6)H(4)COCH(3))与丙酸烷基酯(2a,CH(3)(CH(2))(4)C [三键)进行碳环化] CCO(2)CH(3); 2b,TMSC [三键] CCO(2)Et 2c,CH(3)C [三键] CCO(2)CH(3); 2d,CH(3)OCH( 2)C [三键] CCO(2)CH(3); 2e,CH(3)(CH(2))(3)C [三键] CCO(2)CH(3); 2f,PhC [三联键] CCO(2)CH(3);和2g,(CH(3))(3)C [三键] CCO(2)CH(3))在Ni(dppe)Br(2)和将锌粉在80℃下的乙腈中制得,相应的茚三醇衍生物3a-m具有显着的区域选择性,并具有良好或优异的收率。镍催化的碳环化反应已成功扩展到其他简单的二取代炔烃。因此,2-卤代苯基酮1a-e与双取代炔烃(2h,PhC [三键] CPh; 2i,CH(3)C(6)H(4)C