Tandem arylation-reduction of acyl heterocycles. Convenient synthesis of benzyl heterocycles
作者:Stan S. Hall、Sami E. Farahat
DOI:10.1002/jhet.5570240453
日期:1987.7
arylation-reduction of a series of acyl heterocycles using phenyl-, 4-methylphenyl-, and 4-methoxy-phenyllithium reagents followed by lithium-ammonia-ammonium chloride reduction afforded the corresponding benzyl heterocycles. The acyl heterocycles surveyed in this study contained furan, 2,3-dihydro-4H-1-benzopyran, 4H-1-benzopyran, thiophene, 4,5,6,7-tetrahydrobenzo[b]thiophene, 2,3-dihydro-4H-1-benzothiopyran
使用苯基-,4-甲基苯基-和4-甲氧基-苯基锂试剂将一系列酰基杂环进行串联芳基化还原,然后将锂-氨-氯化铵还原,得到相应的苄基杂环。在这项研究中调查的酰基杂环化合物包括呋喃,2,3-二氢-4 H -1-苯并吡喃,4 H -1-苯并吡喃,噻吩,4,5,6,7-四氢苯并[ b ]噻吩,2,3-二氢-4 H -1-苯并噻喃和吡啶核。除了2,3-二氢-4 H -1-苯并噻吩并-4-酮外,所有酰基杂环均产生相应的苄基杂环,其在还原过程中选择性裂解,得到相应的2-(1-芳基丙基)苯硫醇。
NHC as a Ligand in Heterobimetallic Catalysis: An Insight into a Catalytic Friedel–Crafts-like Reaction
作者:Mukesh Kumar Nayak、Anuradha Mohanty、Sujit Roy
DOI:10.1021/acs.organomet.3c00177
日期:2023.8.14
calculation of local reactivity descriptors, namely, local electron density and the Fukui function index for nucleophilic attack at a center, established that in transition metal–tin heterobimetallic complexes, N-heterocyclic carbene (NHC) is a better ligand than its alkene and phosphine analogues for the coupling of C–H and C–OH bonds. This insight was verified by synthesizing a new complex (NHC)2Pd(Br)(SnCl3)