[formula: see text] Condensation of 3-phenylsulfonyl-1,3-isobenzofuranone (3) with benzocyclohept-6,7-en-5-ones such as 4 and 15 provides a straightforward, general method for synthesis of functionalized benzo[4,5]cyclohepta[1,2-b]naphthalenes (e.g., 5 and 16). This finding was used to achieve a brief and efficient preparation of 6,7-benzo-3,4-(1,4-dimethoxy-2,3-naphtho)-1,5-dioxosuberane (2), an established
[公式:参见文本] 3-苯基磺酰基-1,3-
异苯并呋喃酮(3)与苯并环庚-6,7-en-5-ones(例如4和15)的缩合提供了一种简单,通用的合成官能化苯并[4]的方法。 ,5]环庚[1,2-b]
萘(例如5和16)。该发现用于实现简短有效的制备6,7-苯并-3,4-(1,4-二甲氧基-2,3-
萘并)-1,5-二氧杂
戊烷(2)的方法,天然存在的红色色素皮肤病(1)。