Table 1.
O-Alkylation of 3 to afford 4 as precursors of C-2 substituted HI-236 derivatives.
| R | No. | R | No. | R | No. | R | No. |
|---|---|---|---|---|---|---|---|
 |
4a |  |
4e |  |
4i |  |
4m |
 |
4b |  |
4f |  |
4j |  |
4n |
 |
4c | Bn | 4g |  |
4k |  |
4o |
 |
4d |  |
4h |  |
4l |
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