The synthesis of the title compound, a member of a family of cyclopent
[g]indoles isolated from a marine sponge, is described. Most of the sy
nthetic sequence was developed starting from the more readily availabl
e cis-1,3-dimethylindan. An X-ray crystal structure of the indanol (24
), the precursor of trans-1,3-dimethylindan, confirmed its relative st
ereochemistry.