Unexplored Reactivity of 2-Oxoaldehydes Towards Pictet—Spengler Conditions: Concise Approach to β-Carboline Based Marine Natural Products.

Numerous glyoxals are prepared in situ from acetone (IIj), acetophenone derivatives (IIa-i) as well as other variously substituted acetophenone derivatives and subsequently transformed with tryptophane (I) to carbolines.