The synthesis of 4-aryl-1H-2-benzothiopyran-3-carboxylic acid derivatives by a sodium hydride-mediated thiopyran ring formation of 2-[(2-aroylphenyl)methylsulfanyl]acetic acid derivatives is reported. The precursors were prepared by successive treatment of lithium o-lithiobenzyl mercaptides, which were generated by the reaction of o-bromobenzyl mercaptans with two equivalents of butyllithium, with aromatic aldehydes and 2-bromoacetonitrile or tert-butyl 2-bromoacetate, followed by oxidation of the resulting sulfanyl alcohols with pyridinium chlorochromate (PCC).
MANN, J.;PIPER, S. E., J. CHEM. SOC. CHEM. COMMUN., 1982, N 8, 430-432
作者:MANN, J.、PIPER, S. E.
DOI:——
日期:——
The preparation of lignans via intermolecular cycloadditions with quinodimethanes
作者:John Mann、Susan E. Piper
DOI:10.1039/c39820000430
日期:——
Certain lignans can be prepared using, as the key step, a thermal reaction between 1-(aryl)-1,3-dihydro-5,6-dialkoxy-benzo[c] thiophen 2,2-dioxides and dienophiles.
某些木脂素可以使用1-(芳基)-1,3-二氢-5,6-二烷氧基-苯并[ c ]噻吩2,2-二氧化物与亲二烯体之间的热反应作为关键步骤来制备。