Studies on pyrimidine derivatives and related compounds. XCIV. On the oxidation products of 2-substituted-2,3-dihydro-4H-1,4-thiazin-3-one derivatives.
作者:AKIRA TAKAMIZAWA、HIROSHI HARADA
DOI:10.1248/cpb.28.769
日期:——
Hydrogen peroxide oxidation of 4-(4-amino-2-methylpyrimidin-5-yl) methyl-6-(2-hydroxyethyl)-2-(2-methoxyphenyl)-4-methyl-2, 3-dihydro-4H-1, 4-thiazin-3-one (1c) gave N-[(4-amino-2-methylpyrimidin-5-yl)methyl]-N-[1-(2-oxido-1, 2-oxathiolan-3-yliden)ethyl] (2-methoxyphenyl)oxalamide (3b) and 2-oxido-1, 2-oxathiolane-3-spiro-3'-[1'-(4-amino-2-methylpyrimidin-5-yl)methyl-4'-hydroxy-2'-methylene-4'-(2-methoxyphenyl)-tetrahydropyrrol-5'-one] (6). The former product (3b) was transformed into another product (6) under oxidative reaction conditions and 6 led to the known 1-(4-amino-2-methylpyrimidin-5-yl)methyl-4-hydroxy-3-(2-hydroxyethyl)-4-(2-methoxyphenyl)-2-methyl-Δ2-pyrrolin-5-one (4) and 2-aza-2-(4-amino-2-methylpyrimidin-5-yl)methyl-4-hydroxy-4-(2-methoxyphenyl)-1-methyl-8-oxabicyclo [3.3.0] octan-3-one (5) on acid or alkali treatment. On the other hand, an oxalamide (3d) having a 2-anisyl substituent was recovered under the same reaction conditions. The same reaction with 2-aryl-4-benzyl-2, 3-dihydro-4H-1, 4-benzothiazin-3-ones (12a-c) afforded 2-aryl-4-benzyl-2-hydroxy-2, 3-dihydro-4H-1, 4-benzothiazin-3-ones (13a-c), bis-(2-aryloxalylaminophenyl)-1, 1'-disulfide (14a-b) and 2-aryl-4-benzyl-3-oxo-2, 3-dihydro-4H-1, 4-benzothiazine-1, 1-dioxide (15a-c), while 4-benzyl-2-methyl-2, 3-dihydro-4H-1, 4-benzothiazine-1, 3-dioxide (16b) was mainly obtained in the oxidation of the 2-methyl derivative (12d), which was converted into 4-benzyl-2-hydroxy-2-methyl-2, 3-dihydro-4H-1, 4-benzothiazin-3-oxide (13d) via a Pummerer-type rearrangement. The reaction mechanism is discussed.
4-(4-氨基-2-甲基嘧啶-5-基)甲基-6-(2-羟乙基)-2-(2-甲氧基苯基)-4-甲基-2, 3-二氢-4H-1的过氧化氢氧化, 4-噻嗪-3-酮 (1c) 得到 N-[(4-氨基-2-甲基嘧啶-5-基)甲基]-N-[1-(2-oxydo-1, 2-oxathiolan-3-yliden) )乙基](2-甲氧基苯基)草酰胺(3b)和2-氧化-1, 2-氧硫杂环戊烷-3-螺-3'-[1'-(4-氨基-2-甲基嘧啶-5-基)甲基-4 '-羟基-2'-亚甲基-4'-(2-甲氧基苯基)-四氢吡咯-5'-酮](6)。前产物(3b)在氧化反应条件下转化为另一种产物(6),6产生已知的1-(4-氨基-2-甲基嘧啶-5-基)甲基-4-羟基-3-(2-羟乙基)-4-(2-甲氧基苯基)-2-甲基-Δ2-吡咯啉-5-酮(4)和2-氮杂-2-(4-氨基-2-甲基嘧啶-5-基)甲基-4-羟基-4-(2-甲氧基苯基)-1-甲基-8-氧杂双环[3.3.0]辛烷-3-酮(5)经酸或碱处理。另一方面,在相同的反应条件下回收具有2-茴香基取代基的草酰胺(3d)。与 2-芳基-4-苄基-2, 3-二氢-4H-1, 4-苯并噻嗪-3-酮 (12a-c) 进行相同的反应,得到 2-芳基-4-苄基-2-羟基-2, 3 -二氢-4H-1, 4-苯并噻嗪-3-酮 (13a-c), 双-(2-芳基草酰基氨基苯基)-1, 1'-二硫化物 (14a-b) 和 2-芳基-4-苄基-3- oxo-2, 3-二氢-4H-1, 4-苯并噻嗪-1, 1-二氧化物 (15a-c),而 4-苄基-2-甲基-2, 3-二氢-4H-1, 4-苯并噻嗪- 1, 3-二氧化物(16b)主要是在2-甲基衍生物(12d)氧化过程中得到,转化为4-苄基-2-羟基-2-甲基-2, 3-二氢-4H-1,通过普默勒型重排得到 4-苯并噻嗪-3-氧化物 (13d)。讨论了反应机理。