Mammalian alkaloids: Synthesis andO-methylation of (S)- and (R)-3?-hydroxycoclaurine and theirN-methylated analogues withS-adenosyl-L-[methyl-14C]methionine in presence of mammalian catecholO-methyltransferase
作者:Xiao-Shu He、Dragana Tadi?、Malgorzata Brzostowska、Arnold Brossi、Maureen Bell、Cyrus Creveling
DOI:10.1002/hlca.19910740704
日期:1991.10.30
3′-hydroxycoclaurines 3a and 3b and of the N-methylated analogs 5a,b with S-adenosyl-L-[methyl-14C]methionine in presence of mammalian COMT was investigated in vitro. The N-unsubstituted (1S)- and (1R )-isomers 3a and 3b, respectively, afforded almost equal amounts of the corresponding N-norreticuline 4 and N-nororientaline 19, besides two unknown by-products (see Fig. and Table 1). The N-methylated (1S)-isoquinoline
Ó光学活性3'- hydroxycoclaurines的-Methylation图3a和3b中和的Ñ甲基化的类似物5a,5b中与小号-adenosyl -1- [甲基- 14 C]在哺乳动物的存在甲硫氨酸COMT研究了体外。的Ñ -未被取代的(1小号) -和(1 - [R )-异构体3A和3B,分别得到相应几乎等量Ñ -norreticuline 4和Ñ -nororientaline 19,除了两种未知的副产物(参见图和表1)。所述Ñ甲基化的(1个小号) -异喹啉5a中,在另一方面,在很大程度上得到(小号)-orientaline((小号) - 19),而几乎等量混合物([R)-reticuline(图6b)和(- [R )从(1R)-对映异构体5b获得-原喹啉((R)-19)。异喹啉3a,b和5a,b通过Bischler-Napieralski环化制备O-苄基保护的异喹啉10(方案1)