S. Nakatsuka et al., REGIO-CONTROLLED CYCLIZATION OF 1-(3-METHYL-2-BUTENOYL)INDOLES AT THEIR 2-POSITIONS AND 7-POSITIONS, Heterocyclic communications, 2(6), 1996, pp. 555-558
A quarternary carbon substituent was efficiently introduced at their 2
and 7-positions of the indole nucleus by cyclization of 1-(3-methyl-2
-butenoyl)-indole derivatives 4 and 7, and derived to a reversed preny
l group found in teleocidins 3 or echinulin 11.