Synthesis of photochromic 3-arylvinyl-3H-naphtho[2,1-b]pyrans: An unexpected one-step annulation to cyclopenta[b]naphtho[1,2-d]furans
作者:Stuart Aiken、Orlando D.C.C. De Azevedo、Kieran Chauhan、Christopher D. Gabbutt、B. Mark Heron、Craig R. Rice、Nicola Soltowska
DOI:10.1016/j.dyepig.2022.110710
日期:2022.11
The synthesis and photochromic evaluation of 3-arylvinyl-3H-naphtho[2,1-b]pyrans is discussed. Under acid catalysis, 1,3-diarylpent-1-en-4-yn-3-ols undergo a cascade reaction with variously substituted naphthols involving the formation of an intermediate photochromic naphthopyran which, under the reaction conditions, subsequently undergoes an electrocyclic ring-opening and a double intramolecular cyclisation
讨论了3-arylvinyl-3 H-萘并[ 2,1- b ]吡喃的合成及光致变色评价。在酸催化下,1,3-diarylpent-1-en-4-yn-3-ols 与各种取代的萘酚发生级联反应,包括形成中间体光致变色萘并吡喃,在反应条件下,随后发生电环-在 Nazarov 型反应中打开和双分子内环化,得到 [5,5,6,6] 环戊烯稠合萘并呋喃;该序列构成了一种新的、一锅法、原子有效的环戊二烯[ b ]萘并[1,2- d ]呋喃单元方法。