phenanthrofurans 1 starting with deoxybenzoins 3 is developed with moderate to good yield. A facile process is carried out for the (1) α-propargylation of 3 with NaH and propargyl bromide 2 in refluxing THF, (2) Bi(OTf)3-mediated cycloisomerization of γ-ynones 4 with 4 Å molecular sieves in MeNO2 at rt, and (3) photolytic Scholl annulation of 2,3-diarylfurans 5 with I2 in EtOAc at rt. The key structures of
propargylation on corresponding keto-alcohols or by sodiumborohydride mediated reduction of 2-hydroxy-2-propargyl ketones. The furan synthesis proceeded through iodine mediated 5-exo-trig cyclization, dehydration and reductive deiodination. The method was applied to the synthesis of 2-methylfuran fused to phenanthrene, pyrene and acenaphthylene rings.
In this Letter, we disclose a simple and effective method to access a variety of phenanthro[9,10-b]furan and 1H-dibenzo[e,g]indole derivatives based on the design of a carbene-catalyzed intramolecular Stetter reaction followed by a Paal–Knorr reaction in one-pot. These compounds are a class of π-extended polycyclic aromatic hydrocarbon (PAH) derivatives containing an oxygen/nitrogen atom. The practical
在这封信中,我们基于卡宾催化的分子内 Stetter 反应的设计,公开了一种简单有效的方法来获得各种菲 [9,10- b ] 呋喃和 1 H-二苯并 [ e , g ]吲哚衍生物通过一锅中的 Paal-Knorr 反应。这些化合物是一类含有氧/氮原子的 π 延伸多环芳烃 (PAH) 衍生物。所开发转化的实际效用在克级及其合成后转化上得到证明。
Japp; Klingemann, Chemische Berichte, 1888, vol. 21, p. 2933
作者:Japp、Klingemann
DOI:——
日期:——
Nicolaides, Demetrios N.; Adamopoulos, Spyros G.; Lefkaditis, Demetrios A., Journal of the Chemical Society. Perkin transactions I, 1992, # 19, p. 2479 - 2484
作者:Nicolaides, Demetrios N.、Adamopoulos, Spyros G.、Lefkaditis, Demetrios A.、Litinas, Konstantinos E.