There are numerous criminal charges pending against the petitioner in the Superior Court. He moved to dismiss the charges on the ground that the Commonwealth had failed timely to disclose a police report and the existence of a witness identified in the report; he alleged that, as a result of the delayed disclosure, the witness cannot be located and his defense of the case has been irreparably impaired. A judge in the Superior Court denied the motion to dismiss. The petitioner then filed his G. L. c. 211, § 3, petition in the county court seeking review of the Superior Court judge’s rating.

The case is presently before us on the petitioner’s memorandum and record appendix pursuant to SJ.C. Rule 2:21, as amended, 434 Mass. 1301 (2001). The single justice was correct to deny the petition because the petitioner has an adequate alternative to seeking relief under G. L. c. 211, § 3, namely, a direct appeal in the normal course after trial in the event that he is convicted. Beyond making generalized assertions,1 the petitioner has not demonstrated in his role 2:21 memorandum that a direct appeal after trial would be inadequate to vindicate his claims fully. The result we reach is in keeping with the settled role that the denial of a motion to dismiss in a criminal case is not reviewable as a matter of right interlocutorily — the one notable exception being a motion to dismiss that raises a double jeopardy claim of substantial merit, which is not the case here. Jackson v. Commonwealth, 437 Mass. 1008, 1009 (2002), and cases cited. Ventresco v. Commonwealth, 409 Mass. 82, 83-85 (1991).

Judgment affirmed.