A Simple and Practical Preparation of 2,4-Disubstituted 1-Benzotelluropyrylium Salts
作者:Haruki Sashida、Masahiro Yoshida
DOI:10.3987/com-02-9443
日期:——
(8B) with Grignard reagents (MeMgBr, EtMgBr, PhMgBr and PhCH 2 MgCl) gave the corresponding 4-substituted 4-hydroxy-4H-tellurochromenes (9) in good yields, respectively. The obtained compounds (9) were readily transformed into the 2,4-disubstituted 1-benzotelluropyrylium salts (7) by treatment with Ph 3 C + BF 4 - in acetic acid in high yields. The 4-benzyl-1-benzotelluropyrylium salts (7Ad) and (7Bd)
用格氏试剂(MeMgBr、EtMgBr、PhMgBr 和 PhCH 2 MgCl)处理 2-叔丁基- (8A) 和 2-苯基碲色素-4-酮 (8B) 得到相应的 4-取代的 4-羟基-4H-碲色素 (9) 的产率分别很高。通过在乙酸中用Ph 3 C + BF 4 - 处理以高产率将获得的化合物(9)容易地转化为2,4-二取代的1-苯并碲鎓盐(7)。4-苄基-1-苯并碲鎓盐 (7Ad) 和 (7Bd) 也由 4-苄基-碲色素 (5) 制备,其通过 1-苯并碲鎓盐 (4) 与 PhCH 2 MgCl 反应获得。