一种通过连续[3 + 2]-环加成/[1,5]-σ重排和氮杂-迈克尔反应从炔基环己-2,5-二烯酮和不稳定重氮烷立体选择性合成“全中心取代”多环吡唑的有效方法被报道。所开发的过程具有高度区域选择性和立体选择性。它采用广泛的基材范围来提供结构多样的线性和桥接[4.4。 n .0]稠环吡唑,产率中等至良好。还展示了一锅法和克级合成以及合成转化。
Pd-catalyzed cross-coupling reactions of less activated alkenyl electrophiles (for tosylates and mesylates) with tosylhydrazones: synthesis of various 1,3-dienes
作者:Poojan K. Patel、Jignesh P. Dalvadi、Kishor H. Chikhalia
DOI:10.1039/c4ra09012h
日期:——
Palladium catalyzed cross coupling reaction engaging N-tosylhydrazones of corresponding ketones as a nucleophilic coupling partner and various alkenyl tosylates and mesylates as an electrophiles for the synthesis of various alkenyl derivatives. The salient features of this reactions are (1) no stoichiometric organometallic reagents required, (2) it tolerates a wide range of functional groups, (3) easy
Synthesis of Diarylmethanes via Metal-Free Reductive Cross-Coupling of Diarylborinic Acids with Tosyl Hydrazones
作者:Xijing Li、Yuanyuan Feng、Lin Lin、Gang Zou
DOI:10.1021/jo302207b
日期:2012.12.7
that takes advantage of diarylborinic acids as a cost-effective alternative to arylboronicacids for synthesis of diarylmethanes through metal-free reductive cross-coupling with N-tosylhydrazones of aromatic aldehydes and ketones. The procedure tolerates hydroxyl, halide, amine, and allyl functionality, complementary to the transition-metal catalyzed cross-coupling techniques.