Synthesis of arylboronates by boron-induced ipso-deantimonation of triarylstibanes with boron trihalides and its application in one-pot two-step transmetallation/cross-coupling reactions
The reaction of triarylstibanes (1) with borontrihalides (BCl3, and BBr3) afforded arylboron dihalides (2) by utilizing all the three aryl groups on the antimony. Boron intermediates (2) were transformed to arylboronates (3) in good to excellent yields by treatment with methanol and 1,3-propanediol. Further, the Pd-catalyzed reactions of 2 with organic halides such as 1-bromonaphthalene and benzoyl
Triarylantimony dicarboxylates as pseudo-halides for palladium-catalyzed cross-coupling reaction with arylboronic acids and triarylbismuthanes without any base
diacetates (6) with organoboron reagents (9) in the presence of Pd(PPh3)4 led to the formation of cross-coupling products, biaryls (10, 12 and 14–17), in moderate to excellent yields under mild conditions without any base. Similar reaction of 6 with triarylbismuthanes (18) also gave the corresponding cross-coupling products. Single crystal X-ray analysis of tri(p-tolyl)antimony diacetate (6b) and tris(p-
Palladium(II)-catalyzed hydroarylation of α,β-unsaturated aldehydes and ketones with triarylstibines in the presence of silver acetate
作者:Chan Sik Cho、Koichiro Tanabe、Sakae Uemura
DOI:10.1016/0040-4039(94)88042-5
日期:1994.2
Triarylstibines react with α,β-unsaturated aldehydes and ketones in acetic acid at 25°C in the presence of silveracetate and a catalytic amount of palladium(II) acetate to afford the hydroarylation products by conjugate addition in good yields.
Triarylantimony difluorides were synthesized in moderate to excellent yields by oxidative fluorination of triarylstibanes with nitrosyltetrafluoroborate (NOBF4) under aerobic conditions. This reaction is the first example of fluorination of trivalent organoantimony compounds using NOBF4 as a fluorinating agent. The triarylantimony difluorides exhibited good anti-proliferation activity against tumor
Palladium(II)-Catalyzed Conjugate Addition of Aromatics to<i>α</i>,<i>β</i>-Unsaturated Ketones and Aldehydes with Arylantimony Compounds
作者:Chan Sik Cho、Shin-ichi Motofusa、Kouichi Ohe、Sakae Uemura
DOI:10.1246/bcsj.69.2341
日期:1996.8
Triarylstibines react with α,β-unsaturated ketones and aldehydes in acetic acid at room temperature in the presence of AgOAc and a catalytic amount of Pd(OAc)2 to afford the conjugate addition products (the formal hydroarylated compounds to an olefinic part) in good yields. In contrast, diarylantimony chlorides, arylantimony dichlorides, and diphenylantimony acetate react with the enones and enals