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Syntheses of analogue compounds of cortistatin A (1), an anti-angiogenic steroidal alkaloid from Indonesian marine sponge, were investigated by utilizing the CD-ring fragment of vitamin D₂. The incidental preparation of a new analogue having CD-cis-fused skeleton and its biological evaluation revealed the importance of the CD-trans-fused structure for the potent and selective antiproliferative activity of 1 against human umbilical vein endothelial cells (HUVECs).

Synthetic Studies of Cortistatin A Analogue from the CD-Ring Fragment of Vitamin D<sub>2</sub>