Pd-Catalyzed, Highly Selective C(sp²)-Br Bond Coupling Reactions of o-(or m-, or p-) Chloromethyl Bromobenzene with Arylboronic Acids.

Highly selective C(sp²)-C(sp²) cross-coupling of dihalogenated hydrocarbons comprising C(sp²)-Br and C(sp³)-Cl bonds with arylboronic acids is reported. This highly selective coupling reaction of the C(sp²)-Br bond is successfully achieved using Pd(OAc)2 and PCy3·HBF4 as the palladium source and ligand, respectively. A series of chloromethyl-1,1'-biphenyl compounds are obtained in moderate-to-excellent yields. Moreover, this protocol can be extended to the one-pot dual arylation of 1-bromo-4-(chloromethyl)benzene with two arylboronic acids, leading to diverse unsymmetrical 4-benzyl-1,1'-biphenyl derivatives.

[Case control study on clinical effects of sacrococcygeal manipulation in the treatment of coccyx pain].

OBJECTIVE: To study the clinical efficacy of sacral manual therapy in the treatment of coccygodynia. METHODS: From November 2013 to July 2015, 184 patients with sacrococcygeal pain were divided into treatment group and control group. There were 26 males and 65 females in the treatment group, with an average age of (39.63±11.62) years old. In the control group, there were 31 males and 62 females, with an average age of (41.47±11.56) years old. The patients in the treatment group were treated with sacrococcygeal massage therapy, 3 times a week for 2 weeks. The patients in the control group were treated with Diclofenac Diethylamine Emulgel, 2 times a day for 2 weeks. The VAS pain score, score in rating scale of sacrococcygeal pain and degree of tenderness were obtained on the first day of treatment, 2, 7, 14 days and 3 months after treatment to evaluate clinical results. RESULTS: When comparing the VAS pain score of sacrococcygeal pain within the two groups, the differences began to reach statistical significance on the second day(P<0.001). The chagne of VAS pain scores, the change of scores in rating scale of sacrococcygeal pain and the degree of tenderness in the treatment group were all significontly larger that those in the contral group from the second day. CONCLUSIONS: The curative effect of sacral manipulation group is better than that of Diclofenac Diethylamine Emulgel group in the treatment of sacrococcygeal pain.